THE SLANT 6 - Slant Six Forum
Contents
1. 6 CYLINDER ENGINE All slant six cylinder heads are interchangeable There are no major differences between the various heads The simplest way of identifying the various heads is by thehead casting number A Casting Numbers Head Casting Year Number 64 66 2206035 67 74 2843169 22 13 3614850 72 74 3698995 TSS 3698447 78 3698447 79 80 4104362 81 82 4095778 Note The 75 and newer heads no longer use spark plug tubes It also uses the small BL series spark plugs and the tappets can t be removed with he head installed on the engine The tappets can be removed with the head installed on the older engines B Torque Sequence The chrome alloy cast iron cylinder head Figure 16 1 is held in place by 14 bolts Spark plugs are located at the wide edge of the combustion chambers and aluminum spark plug tubes serve as spark plug gaskets Install cylinder head bolts Starting at top center tighten all cylinder head bolts to 50 foot pounds in sequence Figure 16 2 Repeat the procedure retightening all cylinder head bolts to 65 foot pounds Dowel Hole Front mm Coolant Passages N Oil Food Hole we intake Valves Pr Coolant Passage Dowel Hole Spark Plugs 6 Coolant Passage 6 E a Exhaust Valvos FIGURE 16 1 SLANT SIX CYLINDER HEAD FIGURE 16 2 6 CYLINDER HEAD BOLT TIGHTENING SEQUENCE Comparing Figure 16 3 and Figure 16 4 the differen2. For most high performance off road applications a high engine temperature is undesirable For these applications install a 160 degree thermostat PN 3514174 which will help the engine run cooler NOTE Most summer thermostats currently available are in the 180 185 degree range Winter thermostats are around 195 degrees 3 Electric Cooling Fans These 12 volt electric cooling fans are highly efficient auxiliary bolt ons for street rods race cars and compact or medium sized vehicles They can be installed in front or in back of your radiator quickly and easily Unlike conventional belt drive fans the electric fan will not rob engine horsepower Three sizes are offered with and without thermostat Materials used in construction are of the latest tehnology Application recommendations listed below Use as a guide only due to variances in engine compartment cooling systems design P4349202 12 Fan without thermostat for 6 cyl engines P4349203 12 Fan with thermostat for 6 cyl engines For high speed race engines a small diameter crank Pulley and large diameter alternator and water pump pulleys are desirable Aftermarket sources have these pulleys available and they feature a deep groove design A race engine should use a 3 8 fan belt C Oiling System The pressure provided by the standard oil pump can be increased by installing the black spring PN 2406677 mentioned earlier The windage tray P3690274 can be installed to increase
3. 22 310 1990 108 028 032 B Eng P3690588 Mini Express 107 316 654 107 024 028 B Eng P4120042 R280 4468 08 Crane 280 ON 108 035 035 B Eng P4007279 R286 500 108 Cam Dyn 286 150 107 035 035 Hemi P3690814 SSH 44 108 292 eak GE 106 Zero Hemi P4007945 C D Stock Cheater 342 348 490 480 103 Zero Hemi P3412090 STX22 105 310 590 104 028 032 Hemi P3571029 725 105 340 643 623 103 028 032 Hemi P3690587 Mini Express 104 324 684 663 103 024 028 Hemi P3690591 R 290 446 104 Cran 290 700 678 103 028 032 Hemi P4007253 R292 500 106 Cam Dyn 0292 785 760 103 032 032 Hemi P3690839 R 296 4778 108 Crane 296 7507 726 108 032 032 CAM CHART UPDATE DESIGN REC LIFT INSTALLATION VALVE LASH NGINE CAM KIT CAM I D DURATION OVERLAP VALVE CENTERLINE INTAKE EXHAUST 6 CYL P4286679 D C 268 108 268 52 460 104 016 020 6 CYL P4286681 DC 276 106 276 64 490 102 016 020 A Eng P4286667 D C 248 114 248 20 410 112 Zero A Eng P4286669 D C 260 113 260 34 430 110 Zero A Eng P4286671 D C 272 112 272 48 455 108 Zero A Eng P4286630 D C 280 110 280 60 474 106 Zero A Eng P4349266 D C 324 106 324 620 104 028 032 A Eng P4349245 Stock Cheater 360 H P 106 E Stock 106 Zero A Eng P4349243 Stock Cheater 340 106 u Stock 104 Zero A Eng P4120975 Super Stock Roller 360 106 309 316 630 650 106 035 035 A Eng P4120976 Super Stock Rol
4. deck surface For example removal of 090 will raise the compression ratio of a 225 engine from 8 to 1 up to 9 5 to 1 Removal of 090 will raise the compression ratio of a 170 engine from 8 to 1 to 10 to 1 Using high quality gasoline such as Sunoco 260 compression ratios between 11 and 12 to 1 should perform satisfactorily on the dragstrip West Coast pistons would be required to attain ratios this high Step seal Dykes top piston rings should also be used because they lower engine friction at high speeds Forged racing pistons should be fitted at 008 to 010 clearance The following charts show the resulting compression ratios from a variety of deck heights cylinder head volume and bore sizes SPECIALL NOTE Domed pistons and Dykes rings eadily available for the slant six COMPRESSION RATIO 170 CUBIC INCH ENGINE Cylinder Deck Head Std Compression Ratio Height Volume Bore 020 oversize 040 oversize 040 54 00 8 39 8 46 8 54 52 50 8 57 8 65 8 72 51 00 8 76 8 84 8 91 020 54 00 8 75 8 83 8 92 52 50 8 95 9 04 9 12 51 00 9 16 9225 9 34 00 54 00 9 16 9 25 9 34 52 50 9 38 9 47 IDO 51 00 9 61 9 71 9 81 COMPRESSION RATIO 198 CUBIC INCH ENGINE Cylinder Deck Head Std Compression Ratio Height Volume Bore 020 Oversize 040 Oversize 075 54 00 8 95 9 02 9 10 52 50 9 13 9 20 9 28 51 00 9 73 1 9 39 9 47 055 54 00 9 43 9 39 9 47 52 50 9 9 9 59 9 67 51 00 9 71 9 79 9 88 035 54 00
5. given in Figure 2 2 are measured from the lowest point in the rod travel not from the pan rail This means that the pan must be made deeper than the dimension in the figure by the amount that the lowest point in the rod travel is below the pan rail or bottom of the block r Block Attaching Lowest Pont Flange oi Connecting Pod Travel VA AU V SA TAN UV U Gb d 6 Ave Min Baffle 4l o 10 Front EE Rear eei GA Pick Up Pick Up Pick Up bo Position Tu y Position D Swinging e Pick U SUPERIOR ede af PAN SHAPE Front of Engine Rear of Engine NO WINDAGE TRAY REQUIRED WITH THIS PAN DESIGN FIGURE 2 2 The in car clearances should always be checked carefully before making the pan The important items to watch for are header clearance steering linkage clearance K member clearance and ground clearance The K member will interfere with the front requiring a notch in the front of the pan or in the K member Any notch put in the pan should be kept to an absolute minimum or eliminated completely if at all possible The steering center link will usually pass through the center of the pan This can be done by welding a tube through the pan Again this tube should only be large enough to allow the installation of the center link and also to provide learance during the lock to lock travel of the steering linkage If the rules allow it in the class the engine can be removed and the cen
6. have an interference screw valve lash adjustment The tappets PN 2469501 are mechanical and the same in all engines The 198 and 225 engines share the same pushrod PN 2120514 while the 170 uses a shorter pushrod PN 1947704 The 81 82 slant six uses a hydraulic camshaft and a resulting valve gear are unique to this package The hydraulic tappet is PN 4106028 while the pushrod PN 4173482 rocker arm PN 4173909 and rocker shaft PN 4100397 are also special to this package See a later section on race valve train components The 82 82 slant six uses a hydraulic camshaft and a resulting valve gear that are unique to this package The hydraulic tappet is PN 4106028 while the pushrod PN 4173482 rocker arm PN 4173909 and rocker shaft PN 4100397 are also special to this package See a later section on race valve train components N Intake Manifold The slant six has been produced with three different manifolds a one barrel a two barrel and a four barrel The four barrel manifold PN 2129898 was produced on the 1960 62 engine but is no longer available There are aluminum four barrel manifolds available for the slant six from Weiand or Offenhauser The two barrel manifold PN 2806816 has been used on the marine six cylinder engine and the export 225 engine All slant six intake manifolds are interchangeable The Feather Duster aluminum one barrel manifold PN 3837608 was introduced in 1975 The new aluminum two barrel m
7. your car be obtained before any modification or maintenance is performed THE SLANT SIX II PARTS AND PIECES The engines will now be disassembled and discussed piece by piece as far as what is different what is interchangeable and what is available for special parts Later on we will put these pieces together into packages which will be helpful in improving your engine s performance A Cylinder Block There are two basic slant six blocks One for the 170 engine and the other for the 198 and 225 An aluminum block was produced in 1962 but is no longer available The cylinder block is not serviced separately and can only be purchased as a block with pistons assembly The part number for the 170 block assembly is 2463395 while the 198 and 225 share the same number PN 2951694 thru 1974 The 75 225 assembly is 3462605 The 1976 77 225 engines are PN 4041314 forged crank and PN 4071072 cast crank The cast crank has a special block and the pieces are unique All the blocks are four main bearing designs B Crankshaft Each engine has a different crank The 170 is PN 2843941 the 198 is PN 2951979 and the 225 is PN 2899582 They all have the same main bearing journal diameter of 2 750 and also the same crank pin diameter rod journal diameter of 2 189 They also all have four main bearings While the 225 crank will fit in a 198 engine with the correct rods the 225 crank will not fit in a 170 engine it interferes with the block The 19
8. 25 008 017 0015 002 011 013 198 0015 0025 008 017 0015 002 011 015 170 0015 0025 008 017 0015 002 011 015 P Torque Specs Connecting Rod Nut Sto 45 ft lbs H D 50 55 with oil Cylinder Head Bolt 65 Main Bearing Cap Bolt 85 Spark Plug 30 Camshaft Lock Bolt 35 Carb to Manifold Nut 30 Exhaust Manifold Nut 10 Flywheel to Crankshaft 59 Flex Plate to Crankshaft EE Flex Plate to Converter 270 in lbs Intake to Exhaust Manifold Bolt 200 in lbs Rocker Shaft Bracket Bolt 30 ft lbs THE SLANT 6 IV SPECIAL CAR PACKAGES Several special car packages have been produced using the slant six as the base engine The following information is an outline of what these packages consisted of A 1960 Hyper Pak 170 The Hyper Pak was the highest output per cubic inch slant six ever produced It had a long duration high lift camshaft and special valve springs high compression pistons four barrel carb and special intake manifold This makes for an excellent racing package Mopar Hyper Pack Major Components PART NAME 2205620 Assy Camshaft 1944554 Assy Valve Spring amp Damper 2129619 Assy Valve Push Rod 2129898 Manifold Intake 2129899 Manifold Exhaust Front 2129900 Manifold Exhaust Rear 2129881 Assy Carburetor 2121952 Gasket Carburetor Flange 2129992 Assy Air Cleaner 1821170 Gasket Air Cleaner 2201223 Assy Clutch Cover amp Pressure Plate 2201219 Assy Clu
9. 4027596 4071051 4027163 4027593 4027596 4071051 Direct Connection Mopar Cam Chart One word of caution relative to degree wheels The DC degree wheel P4286552 is a zero to 180 design which will yield the numbers listed above Other manufacturers carry 0 degrees 90 degrees 0 degrees design degree wheels which will not directly yield the numbers above For example the 130 degrees on the DC wheel would be 50 degrees on the other style The correct answer is obtained by subtracting 50 degrees from 180 degrees for 130 degrees or by subtracting 50 degrees from 90 degrees answer 40 degrees and adding this to 90 degrees 40 degrees 90 degrees 130 degrees Using the DC degree wheel eliminates a lot of confusion and lessens the possibility of making errors Note Degree Tape P4120993 A offset keys new PN P4286500 B RB HEMI offset bushing P3690936 The cam chart that lists the various cams sold by the Direct Connection in the last few years follows It is based on rocker ratios of LA 1 5 B RB 1 5 Hemi 1 571 1 52E Direct Connection Mopar Cam Chart Design Cam Int Lift Centerline Valve Lash Engine Cam Kit Cam I D Duration Valve Retainer Intake Exhaust 6 Cyl P4120243 D C 244 108 244 436 102 010 020 6 Cyl P3690766 SS14 112 268 lt 45 0 108 016 020 6 Cyl P3690768 ST21 110 286 2020 108 016 020 A Eng P3412044 68 340 Man 114 276 284 444 453 112 Zero A Eng P3690213
10. 75 1 72 1 62 1 60 1 50 1 46 1 36 NOTE BE SURE THAT INTAKE amp EXHAUST NOTCHES ARE PAIRED CORRECTLY ON EACH PISTON DO NOT CUT NOTCHES DEEPER THAN NECESSARY TO OBTAIN CORRECT CLEARANCE AS THIS WILL REDUCE COMPRESSION RATIO ASSEMBLE ALL PISTONS WITH NOTCH TOWARDS REAR ENGINE MINIMUM PISTON TO VALVE CLEARANCE 090 100 FIGURE 2 4 J Cylinder Heads The cylinder heads on the slant six engine are very straight forward and require very little special or custom machining or other items The head is very rigid and very few head gasket problems are ever encountered especially if the steel gasket is used There are several special considerations which we will cover in the next few sections 1 Big Valves The standard six cylinder valves are 1 62 inlet and 1 36 dia exhaust Bigger valves can be installed as follows Exhaust Valve Oversize The 1957 Dodge V 8 exhaust valve 1827958 makes a very convenient oversize valve for the slant six The head diameter is 1 5 or 140 oversize and the length is satisfactory It is necessary to provide a clearance notch at the top of the bore Outdated info see below Included for reference only Inlet Valve Oversize The 1 3 4 dia 1634744 exhaust valve from the 1957 or 1958 Chrysler 392 V 8 can be made into a 130 oversize inlet valve However it is necessary to reduce its length by 270 and cut three more lock grooves down the stem No bore notch is required for clearance for thi
11. 76 77 forged crank for the 225 is 3830099 while the cast crank is 3751036 The cast crank is nor interchangeable with the forged crank The forged crank was phased out of production at the end of 1976 The cast crank engines can be identified by an E stamped next to the engine number i e 225E The best crank to use for heavy duty six cylinder applications with the 225 engine is the 225 truck crank which is shot peened The number for the trucko crank is 2899582 with pilot bushing In 1968 the slant six s crank flange was changed The flywheel pilot and torque converter nose diameters were enlarged on the newer cranks These cranks are interchangeable except for this The 68 69 large pilot crank for the 170 engine is PN 2843941 The 198 and 225 listed above are large pilot cranks The flywheel flex plate attaching bolt pattern for the six is unique It has six bolt holes but they are located in a different pattern than the A or B engines C Cylinder Head All slant six cylinder heads are interchangeable There are no major differences between the various heads The simplest way of identifying the various heads is by the head casting number From 1964 to 1966 the cylinder head casting PN 2206035 was used In 1967 anew head casting PN 2843169 was introduced with a slightly revised combustion chamber shape This head was still used in 1973 in some applications In 1971 another new head casting PN 3614850 was introduced for emissi
12. 9 71 9 79 9 89 52 50 9 92 10 01 10 11 51 00 10 15 10 24 10 34 COMPRESSION RATIO 225 CUBIC INCH ENGINE Cylinder Deck Head Std Compression Ratio Height Volume Bore 020 Oversize 040 Oversize 140 54 00 8 89 8 95 9 02 52 50 9 04 GSR 9 17 51 00 9 20 9 27 9 34 120 52 00 95 20 9 27 9 34 52 50 9 37 9 44 9 51 51 00 9 54 9 61 9 69 100 54 00 9 54 9 61 9 69 52 50 9 72 19 80 9 88 51 00 9 90 9 99 10 07 NOTE All compression ratio figures are with a standard steel head gasket with a compressed height of 020 N Boring and Milling Specifications All the 1970 1976 slant six engines can be overbored 060 maximum The thin wall lighter weight 1977 1982 blocks shouldn t be bored past 030 oversize However if the engine is to be used for high output racing purposes the cylinder wall thickness should be checked to be sure that that particular block doesn t have a bad case of core shift The cylinder wall thickness should be the same all the way around or thicker on the major thrust side i e passenger side of the cylinder bore as installed in the car Milling the cylinder head will reduce its volume and increase the engine s compression ratio To reduce the chamber volume one cc mill the head 0063 The intake manifold surface doesn t have to be milled O Engine Clearances Conn Piston Engine Brg Clear Rod Side To Well Ring Disp Rods amp Mains clearance Clearance End Gap 225 0015 00
13. Nichols amp L S Shepard Staff Engineers Package 4 Barrel Set Up General Multi Purpose Carburetor Holley List 6299 Manifold Offenhauser Aluminum 4 Barrel PN P3690801 Manifold Modifications None Carb Specifications 390 cfm Holley vacuum secondaries Primary Jet 49 Secondary Jet 52 Power Valve 25R 591A 65 PV Channel Restriction 052 Idle Air Bleed 078 High Speed Bleed 043 Diaphragm Spring Yellow This is the best general purpose four barrel setup for the 6 cylinder engines Package 4 Barrel Set Up Race Only Carb 4 Barrel Holley List 7191 PN P3690930 Manifold Offenhauser Aluminum 4 Barrel PN P3690801 Exhaust Heat Blocked Manifold Modifications Car mounted with primaries toward the front of engine See Figure 21 1 Carb Specifications 600 cfm Holley double pumper dual feed with mechanical secondaries Manual Choke Throttle Bore 1 9 16 x 1 9 16 Venturi 1 1 4 x 1 5 16 Primary Jet 64 Secondary Jet 72 Power Valve Channel Restriction 046 Power Valve No 65 Pump Shooter Primary 025 Secondary 021 NOTE THIS MODIFICATION IS FOR HOLLEY CARB P3690930 ONLY 1 2 9 4 5 Front de Primarios FIGURE 21 1 6 CYLINDER 4 BARREL Note For general multi purpose or brackets the previous carb set up is recommended This package is for all out racing only Package 2 Bbl Set up with Headers Carb 2 Bbl Cart
14. Street Hemi GT 112 284 471 474 109 Zero A Eng P3690769 SSH 44 108 292 ed LLO Zero A Eng P4007619 SSH 25 44 286 292 485 510 108 Zero A Eng P4007275 C D Stock Cheater 336 348 462 473 108 Zero A Eng P4120231 D C 284 108 284 484 108 Zero A Eng P4120231 D C 292 108 292 509 108 Zero A Eng P3412016 sT21 108 286 2920 110 018 022 A Eng P2836146 STX21 105 306 960 105 028 032 A Eng P4120653 D C 284 112 284 542 110 028 032 A Eng P4120655 D C 296 110 296 shot 108 028 4032 A Eng P4120657 D C 312 106 312 606 104 028 032 A Eng P4120148 D C 320 102 320 630 100 024 028 A Eng P3690795 R280 427 1 10 Crane 280 640 108 A Eng P3690589 Magna Velocity 110 324 633 110 024 028 A Eng P4007278 R 278 284 413 427 06 278 284 620 640 106 035 035 Cam Dyn A Eng P4007509 R 284 427 05 Cam Dyn 284 284 108 035 035 A Eng P3690796 R 296 4778 1 10 Crane 296 CET 109 024 028 B Eng P3690214 Street Hemi Gr 108 284 471 474 106 Zero B Eng P3412073 SSH 25 108 5 286 485 108 Zero B Eng P3690812 SSH 44 108 292 s510 106 Zero B Eng P4007277 C D Stock Cheater 352 380 467 483 108 Zero B Eng P4120235 D C 284 108 284 484 108 Zero B Eng P4120237 D C 292 108 292 3909 108 Zero B Eng P3690816 Stage 11 115 300 308 519 110 028 2032 B Eng P4120659 D C 284 112 284 S528 110 028 1032 B Eng P4120661 D C 296 110 296 soo 108 028 032 B Eng P4120663 D C 312 1006 312 390 104 028 032 B Eng P3690159 STX
15. THE SLANT 6 I INTRODUCTION This racing manual has been prepared as a guide for the customer who wants added performance or reliability from his slant six Included are tips covering several different types of racing for all three engine sizes that have been produced to date The procedures outlined in this manual represent those that have been tested by Chrysler Engineering working both at the race track and on the dynamometer as part of its continuing performance development program This development program serves as the foundation for the Direct Connection parts program The slant six engine was introduced in 1960 in two versions 101 hp 170 cu in and a 145 hp 225 cu in From this modest beginning the slant six built its reputation for performance and reliability The 148 hp 170 cu in Hyper Pak introduced in the 1960 Valiant was the next step and the one that was to prove the new engine worthy of any performance challenge In 1960 with the introduction of the new compact cars by all the American automobile manufacturers NASCAR sanctioned a special race exclusively for the little 6 cylinder powered compact cars The race was held at Daytona and had seven slant six Valiants entered When the race ended not only had all seven HyperPaks finished proving their reliability and durability but they won the first seven places This type of performance speaks for itself The Hyper Pak option was carried over into 1961 and also made availabl
16. ain bearings come in two materials F 77 Tri Metal recommended for oval track cars and long life durability and the softer materials alum or babbitt for drag and other race cars and very high rpm The recommended main bearings clearance for racing should be 0 002 to 0 003 Includes upper and lower shells All are 1 2 grooved P4286924 60 76 Forged Crank Alum Std Size P4286927 60 76 Forged Crank Alum 010 Undersize P4286930 60 76 Forged Crank Tri Metal Std Size P4286933 60 76 Forged Crank Tri Metal 010 Undersize P4286928 76 84 Cast Crank Babbitt Std Size P4286934 76 84 Cast Crank Tri Metal Std Size The main bearings are not interchangeable between the cast and forged crank engines F Vibration Damper The 170 198 and 225 all use the same vibration damper PN 2806211 The 76 77 cast crank engine uses a different damper PN 4071060 They should not be swapped G Camshaft The best production cam available for the slant six engines was used in the 1971 1977 engines This cam PN 3512639 has a 244 degree duration 26 degree overlap and a lift of 406 on the intake and 414 on the exhaust The valve lash of this cam should be 010 on the intake and 020 on the exhaust Both of these settings are hot In 1960 Plymouth introduced the Hyper pak 6 which used a more radical cam PN 2205620 This cam has a duration of 276 268 44 degrees and a lift of 430 This camshaft is no longer available fr
17. anifold PN 4041042 was inIroduced on the 1977 models and is superior to the old export manifold mentioned above See later section on high performance manifolds O Flywheel The standard flywheel uses a 9 1 4 clutch unit There is a flywheel PN 2863405 which will accept an 11 clutch but requires a different bell housing P Engine oiling The standard slant six oil pump should be sufficient for most uses If more oil pressure is desired the standard oil pressure relief spring can be replaced with a stronger spring PN 2406677 used in the Hemi oil pump There is also a windage tray PN P3690274 available See Oiling System Section High performance high output oil pump assembly Provides a 25 increase in oil volume Ideal replacement for stock pump in high performance applications Comes fully assembled with special pickup and ready to install P4286740 Hi Po Oil Pump Assembly O Ignition The standard ignition system on the six cylinder from 1960 to 1972 has been a single point distributor system The 1973 83 six cylinder engines introduced the new electronic ignition system on the six The electronic ignition system distributor PN 3755038 or PN 3755045 2 bbl engine will fit any six See the next section for the electronic ignition conversion parts plug wires etc R Engine Paint Direct Connection s engine paint matches the factory original colors so you can keep your engine compartment looking authentic 16 ounces of quick
18. ars and long life durability and the softer materials alum or babbitt for drag and other race cars and very high rpm The recommended main bearings clearance for racing should be 0 002 to 0 003 Includes upper and lower shells P4349009 60 76 Forged Crank Babbitt Std Size P4349010 60 76 Forged Crank Babbitt 010 Undersize P4349011 76 84 Cast Crank Babbitt Std Size P4349012 76 84 Cast Crank Babbitt 010 Undersize L Pistons All the slant six engines use the same piston The standard bore size piston is PN 2084384 There are four oversize pistons available in the sizes of 005 020 040 and 060 The piston pin is a press fit in the rod and has a diameter of 9008 M Valves and Valve Gear All the above cylinder heads use the same size valves which are 1 62 diameter on the intake and 1 36 diameter exhaust The six cylinder engine has used one valve spring PN 1739534 The blueprint specs are 74 1 62 closed and 150 1 31 open The valve spring installed height is 1 62 The best valve spring available for higher engine speed operation with high performance camshafts with cam specs of up to 284 degree duration and 470 lift is the 340 valve spring PN 2863439 This spring will increase the valve open load approximately 50 60 pounds The stock valve spring retainer PN 2402045 is the same for all sixes but a heavy duty retainer PN 2202546 is available The rocker arms PN 1947594 are mechanical and
19. ce in spark plug arrangement can be seen FIGURE 16 3 OLD STYLE SLANT SIX n Tre ER EEA Gurr Py Ska Lars d FIGURE 16 4 NEW STYLE SLANT SIX The outside edges of the 6 cylinder head s combustion chamber is machined or relieved next to the two valves as shown in Figure 16 5 If oversized valves are installed these reliefs should be enlarged FIGURE 16 5 TYPICAL SLANT SIX COMBUSTION CHAMBER IV A ENGINE There are basically only two different cylinder heads that have been used on the LA engines from 1964 to 1984 a small port 273 318 and a big port 340 360 There have been only three different valve combinations in these heads one for the 273 and 318 with 1 78 intake and 1 50 exhaust one for the 1968 1971 340 with 2 02 intake and 1 60 exhaust and one for the 360 and the 1972 1973 340 with 1 88 intake and 1 60 exhaust A Casting Numbers Casting Year Engine Number 1964 1965 273 2465315 1966 273 2536178 1967 273 318 2658920 1968 1971 318 2843675 1968 1971 340 2531894 1970 340 6 MI T A 3418915 1971 1972 1972 1973 1974 1973 1974 1973 1975 1975 1976 1976 1977 1979 1980 1981 82 3 3 3 CO CO CO CO CO CO CO CO CO CO 60 8 8 8 O H oO H b bo GO or H GO GO GO GO GO GO GO 0 O 340 360 340 360 360 w air pump 3418915 2843675 3671587 2843675 3671587 3671587 3769973 3769974 3769973 3671587 3769974 4027163 4027593 4027596 4071051 4027163 4027593
20. drying enamel included in each can for painting engine blocks parts or for fast touch up Choose from six authentic colors See description below for proper application P4120751 Race Hemi Orange A bright orange color used on cars equipped with Max Wedge engines 413 and 426 Cross Ram during 1962 64 Also used on 426 race Hemi s built in 1964 65 P4349216 Street Hemi Orange A reddish orange color used on 426 Hemi s built in 1966 71 Commonly referred to as Hemi Orange During 1969 71 the high performance 383 and 440 engines and in 1970 7 1 the 340 engines were also painted this color P4120753 Black All 2 2 engines since 1981 and 318 and 360 engines since 1983 have been painted black from the factory P4120752 Turquoise This medium blue green color was used on all B RB big blockengines during 1962 71 with the exception of the high performance 383 440 engines which were painted Street Hemi Orange P4349218 Red This is the bright red color used on all 273 engines from 1964 69 Also the 1968 69 340 engines and most mid 1960 s 318 engines were finished in this color P4349217 Blue This medium blue color was used on all production engines from 1972 83 with exception of the 2 2 engine Most 318 engines built from the late 1960 s through 1972 were painted this color THE SLANT 6 III OFF ROAD MODIFICATIONS In this group of sections we will discuss modifications using the parts mentioned earlier and some special racing part
21. e on the 225 but 1962 was the beginning of the big inch factory hot rod and the Hemi was coming The little slant six got lost in the eight barrel carburetors The slant six now had to settle for the more mundane job of economical and dependable transportation The performance history of the slant six had the usual highlights four barrel intake system high compression pistons long duration mechanical camshafts aluminum blocks and one of the first performance four speed manual transmissions with an in line six in 1965 But that was in the 60 s and the emphasis in the 70 s was fuel economy Again the slant six was equal to the task In 1975 the Feather Duster and Dart Light were introduced to demonstrate the economy of the slant six This package had a four speed overdrive and many lightweight body pieces The slant six responded with an EPA highway number of 36 mpg This is the best fuel economy turned in by an American 6 cylinder compact At the end of the 69 production year the 170 slant six was dropped and in 1970 a new 198 cu in version was introduced to replace it At the end of 1974 his version too was dropped and only the 225 survives The three engines share a common bore of 3 4 The 170 engine has a 3 125 stroke the 198 engine has a 3 64 stroke and the 225 has the longest stroke at 4 12 Major internal differences between the engines include crankshafts rods and camshafts although the camshafts can be interchanged between t
22. e rejetted Plate Shaped Like 2 Bbl Gasket Welded on Std Manifold Cylinder Head Face Carburetor Float Bow Points this Way Front of Car FIGURE 2 3 c B Engine Two Barrel The larger two barrel from a 361 or 383 can be installed as in b above However low speed driveability in cold weather may be unsatisfactory for general use 2 Bbl Manifold Iron 4041042 Alum 4095066 2 Bbl Carb Man 4027757 Auto 4027721 If above parts are not available see Section 6 on the next page d Four Barrel The AFB from the 273 power pack can be adapted to the 225 six cylinder The four barrel bores must be centered on the standard six cylinder inlet manifold s plenum chamber e 3 2 Barrels Race Only Three Weber dual carburetors 48 IDA will improve engine output nicely compared to Hyper Pak inlet manifold and carburetor on the slant six Obviously a hand fabricated inlet manifold would be required one cylinder per Weber throttle bore 4 Slant Six Carburetor Calibrations Hyper Pak Manifold possible to use aftermarket manifold like Offenhauser Carter AFB 42948 Chrysler No 2843111 should be used This carburetor is used on the 1967 273 CI 235 HP engine with the manual transmission Earlier carburetors used with this engine and manual transmission can also be used This carburetor should be modified as follows a Replace the metering rods with No 16 480 068 065 051 b Replace the throttle arm side sec
23. ecessary to extend plug life The plug gap should be 040 with the high output coil PN P3690560 and 060 with the multi spark ignition The standard spark plug for the slant six is a N 14Y If the end plugs tend to foul during warmup the cylinders 1 and 6 may want a hotter plug such as a N 18Y For high performance applications the N 10Y or N 12Y should be adequate Locating the colder race plugs can be difficult and you may be having a hard time locating high performance spark plugs Direct Connection s got all of those hard to get Champion spark plugs in stock for every engine P4286562 N60Y Champion P4286563 N63Y Champion P4286564 N7YC Champion replaces N65Y P4286565 N9YC Champion replaces N66Y Note These are all colder than the N 10Y mentioned above These plugs are for racing only B Cooling System The stock cooling system is adequate to keep operating temperatures to accepted levels However several components may be changed to reduce power losses in the system 1 Fan A viscous fan drive PN 2003059 and fan PN 2585376 will bolt on in place of the stock components to reduce the fan resistance at high engine speeds The same effect or result can be obtained by using a plastic flex fan Be sure that these larger fan units have adequate radiator clearance NOTE If the viscous fan is to be used be sure to check for clearance to the radiator The minimum clearance should be 3 4 inch 2 Thermostat
24. ed as the seal There are also complete hoods for some cars that already have a good scoop such as the 1969 Road Runner or 1970 challenger T A Small scoops are of no value A scoop should have 30 in sq of opening to be effective See Chassis Book P4349341 F Fuel System A race car in Formula Stock or Modified Production or similar race cars should use two Carter 4594 electric pumps PN P4007038 in parallel Parallel means having two inlets and two outlets rather than one pump feeding into the second pump The mechanical pump should also be used The recommended fuel line is 3 8 diameter and it should be the same diameter from the electric pumps to the carburetor s Only one Carter pump should be used in Stock with mechanical pump The electric pump s should be hooked up so that it only works when the key is in the ON position A separate switch in conjunction with the ignition key is optional G Induction System The intake manifold and carburetor make up the engine s induction system The slant six has used a one barrel a two barrel and a four barrel intake manifold on production engines There is an aluminum version of both the one barrel and the two barrel manifolds The Hyper Pak four manifold is no longer available but a four barrel manifold is available from the Direct Connection Program PN P3690801 as is an aluminum two barrel intake P4286281 1 Carburetion For any racing application the carburetor must be specially
25. emical products in each kit Silicone RTV Gasket Remover Lubriplate Spray White Lube Anaerobic Gasket Maker Lock N Seal Brake and Carb Cleaner Penetrating Fluid Spray Gasket Adhesive Thread Sealant with Teflon and Hand Cleaner Everything you ll need to spare a headache is in this convenience kit P4286559 We suggest having this kit on hand before you start rebuilding your short block If the head or block or both have been milled a total of 080 or more we recommend using hardened washers P4120457 on the head bolts upon reassembly 1 Pistons Factory pistons have the pin offset to reduce piston slap By reversing the offset reversing the piston engine friction can be reduced Forged racing pistons for the slant six are available from TRW their part no L2125F Other manufacturers such as Forged True and Venolia also offer forged pistons for the six It is possible to make the dome too high and too sharp which can have an adverse effect on the output of the engine If this is the case then some of the blocking dome should be removed and some of the steep angles and sharp edges should be rounded over 2 Connecting Rods Do not increase connecting rod side clearance beyond the specified 017 the acceptable range is 008 to 017 Excessive side clearance increases the oil demand of the engine as a result of excessive oil leakage past the rods Increasing oil demand reduces the oil available for lubrication and cooling at hi
26. engine power output This tray attaches to the main bearing bolts similar to a 340 The following parts are needed to install the tray four 340 main cap screws PN 6027355 eight two per bolt Hemi main bolt washers PN 2468135 and four tray attaching screws PN 6023092 All parts included in windage tray attaching package PN P3690939 If the 340 head bolts are shortened to the correct six cylinder bolt length and no main bolt washers used the tray will be too close to the crank and will hit making a tinny sound If the bolt shortening is done or interference occurs for some other reason spacers or washers will have to be added between the windage tray and the head of the main cap bolt Be sure that the crank doesn t interfere with the tray before the pan is reinstalled Loctite the windage tray bolts The minimum clearance between the tray and the crank rods should be 125 The dipstick may rattle against the tray with engine vibration It can be carefully bent a slight amount so that the rattle goes away In high speed fully modified engines provision must be made for more oil flow through the main bearings to the rod bearings One way to achieve this is to groove the crankshaft A better way is to use the upper main bearing shells in the main caps It will be necessary to file down the locating tabs to allow the grooves to align These tabs merely locate the bearings The tabs do not prevent rotation the inserts are crushed by the cap
27. er BBD 81375 Manifold Production Aluminum Manifold Modifications None required Carb Specifications Throttle Bore 1 7 16 Primary Jet 2 Steps Richer Venturi 1 1 16 Secondary Jets N A Package Hyper Pak Four Barrel Carb Carter AFB 3083 PN 2129881 No Longer Available Manifold Chrysler Aluminum Hyper Pak No Longer Available Manifold Modifications See Figure 21 2 Carb Specifications Carter AFB Throttle Bore 1 7 16 x 1 9 16 Venturi 1 1 16 x 1 1 4 Primary Jet 120 389 089 Throttle Side Choke Side Secondary Jet 120 350 050 120 365 065 WOT PT Metering Rod 16 51 060 x 065 Float Setting 9 32 Inverted Measured from float bottom to gasket Accel Pump Shooter 028 Idle Feed 035 Special Note This carb and intake manifold system has the primaries of carb facing toward the engine See Figure 21 2 SCREW TO MANIFOLD FLOOR TO PREVENT CYLINDERS 3 amp 4GOINGOVER RICH AT HIGH SPEEDS FIGURE 21 2 HYPER PAK INLET MANIFOLD
28. g and the 040 wide gap plugs should be used The 1 5 8 primary tube headers should be used A cheater or blueprint camshaft is a must They can be obtained from Competition Cams Crane Lunati etc The stock valve spring specifications must be met See Bulletin 35 for further details B NHRA IHRA Super Stock Racing The best choice for racing the slant six in NHRA IHRA Super Stock competition is the 1960 HyperPak Valiant The four door sedan fits into SS U In NHRA competition 17 0 pounds per horsepower is the lowest class If lower classes were used and the current 75 rule is in effect the sedan also makes a good car in the 18 0 class and the wagon fits well in the 19 0 class The original Hyper Pak four barrel manifold is probably the best bet for intake manifolds Refer to Chapter 21 for jetting information A good camshaft choice would be an DC 276 P4286681 as a baseline step and progressing to an STX 22 Both cams are require special valve springs and retainers which are available from the 340 racing program The part numbers are mentioned earlier and they are available from the Direct Connection Program The minimum head volume is 52 3 cc The HyperPak has domed pistons for higher compression ratio The dome height is 250 above the block and the dome volume is 13 7 cc These special domed pistons should still be available from Forged True The electronic ignition should be installed on any Super Stock engines This conversion
29. gh speeds Rods from the cast crank engines are unique and are not interchangeable with any of the other slant six rods All the slant six rods use a pressed pin For any heavy duty application the high strength rod bolts and nuts should be used 3 Engine Break In with Rough Bore Finish When chrome flashed rings are used the cylinder bore finish should be 30 40 micro inches This is fairly rough compared to production bore finish of 20 30 micro inches Use a medium stone and clean it frequently to avoid scratching the bores The cross hatch angle should be 43 degrees 60 degrees included angle The proper break in procedure with the above bore finish is Number Shift Cycles shift Speed 10 part throttle 3500 5 part throttle 5000 cool down to dead cold 3 part throttle 6000 3 open throttle 6500 cool down RACE NOTE Engine should not get over 180 degrees during the break in cycle 4 Engine Break In with Smooth Bore Finish With the new smooth hone finish AN 501 Sunnen stone wet on the cylinder walls the following procedure should be used for engine break in Each run should consist of short interval 1 2 to 2 3 load bursts 5 6 runs total beginning at 4500 rpm Increasing the engine speed each time approximately 500 rpm Final run of break in cycle Max power rpm NOTE Engine should not get over 180 degrees during break in cycle 5 Balancing It is not necessary to balance an engine using producti
30. has the small drive pinion bearing and can be used in the six s bellhousing by using the special drive pinion bearing retainer PN 3878596 If the overdrive transmission is desired it uses the special retainers so that it doesn t need to be changed There are two overdrive transmissions one with a cast iron case PN 3878005 and one with an aluminum case PN 4028477 Special Note 1 Many part numbers listed in this chapter are given for reference They may not be currently available Special Note 2 The information listed in this chapter is more up to date than any other recommendations Therefore this chapter supersedes all previous 6 cylinder engine bulletins and books Slant Six Cylinder Heads Introduction One of the most important parts of an engine assembly is the cylinder head It holds the key to making power It also offers the opportunity to make more horsepower Cams headers carburetion can only go so far making horsepower without the cylinder head However cylinder heads can be expensive but may be one place in the engine where spending the extra money may be worth it GENERAL BACKGROUND We will leave most of the specific details on the cylinder heads how to prep etc to the various engine chapters Please refer to them earlier in this book We will include cylinder head torque sequences and the various casting numbers for reference In this chapter we will concentrate on photos and sketches showing various features of the heads
31. hem Year Cubic Inch Bore x Stroke 1960 83 225 3 40 x 4 12 1970 73 198 3 40 x 3 64 1960 69 170 3 40 2x 3 125 Note The parts that were used on the 1960 61 Hyper Pak six cylinder are no longer available from Mopar or Chrysler Parts and are very difficult to find in general Special Note The Slant Six 225 was dropped from passenger car production at the end of 1983 It is still in production for trucks in 1984 The slant six engines can be easily identified from other makes because they are slanted over to the right It has the intake and exhaust manifolds both on the left side and the oil pump distributor and spark plugs on the right side To identify one version from another the engine number is needed which is located on the top right side of the cylinder block toward the front The number 170 or 225 etc is stamped clearly along the ledge just below the head The date that the engine was built and oversize undersize parts replacement information are also located next to the engine number While this chapter covers the slant six engine specifically other engines such as the LA or B engine are covered in other engine manuals located elsewhere in this book There are also racing manuals covering chassis items including transmissions axles and front and rear suspensions located in the chassis book P434934 These manuals do not try to duplicate the service manuals We therefore highly recommend that the correct service manual for
32. hey are not the same The short one goes on the exhaust valve Note If dual springs are used then use PC package P3690963 6 Valve Spring Recommendations 6 Cylinder Valve Spring Recommendations Camshaft Duration Lift Valve Spring P4120243 244 436 P4286813 P4286679 268 460 P4120249 P4286681 276 490 P3412068 7 Tappets The three camshafts listed above use a standard style mechanical tappet P4286774 This can be used as service replacement on all production 6 cylinder mechanical cams The aftermarket cams Racer Brown Crane etc may use a different style Be sure to check with the manufacturer 8 Notching the Piston for Valve Clearance In many cases when large long duration and or high lift camshafts are installed in stock engines a notch in the piston is required The proper location for these notches is shown in Figure 2 4 As a general rule camshafts in the 225 of 290 degree duration and longer will require a notch The 72 77 low compression engines aren t as critical as the earlier 170 198 engines This holds true only as long as the heads have not been milled or the block decked Clearances in the 170 are also much closer and camshafts bigger than stock should be checked for valve to piston clearance Centerline Axis of of Cylinder Cutter 78 Top of Biock f IT x 25 Zero Deck 035 Height Center Centerline Piston Exhaust Centerline Intake 94 ta Cutter Size Valve Size 1 85 1
33. hile the muffler is PN 4004381 This is a bolt in system on the various 67 76 A body cars For hot rod applications the large diameter pipe PN 4004379 can be adapted to a street hemi muffler PN 2781300 for a low restriction exhaust 2 Headers Cylinders 1 2 3 should exhaust through 1 1 8 or 1 3 4 O D pipes about forty inches long into a cloverleaf collector and then through a 2 1 2 O D outlet pipe much like current V 8 Super Stock practice Cylinders 3 4 5 should have a duplicate system See Figure 2 10 i Maintain Exit From For S d Diagram 2 or Secondary a Head As Smooth As Attachment Possible 1 x 40 or E 134 x 40 Approximately Note Make From a Rolled Cone Of Sheet Metal Crease Z Z Should Continue For The Full Length of Booster Fit As Close Fill In As Possible In This Space Pipes amp Weld Closed C Section A Section B Section C Each Pipe Has An Area All Cross Sectional Areas 22 Dia Or Slip Fit Total Area of Section A After Section A Must Be Joint To Connect Should Be As Close To 3 Less Than The Area Of Secondary Pipe Times The Area Of Individual Section A Pipes As Possible FIGURE 2 10 A The Direct Connection six cylinder headers PN P4007602 are a 15 8 x 40 primary with 2 1 2 collector design which fit the 67 76 A Body and 62 74B amp E Body M Compression Ratio Up to 090 can be removed from the slant six cylinder head The slant six cylinder head has an especially thick lower
34. introduced for the slant six Although they have all been produced on the 225 they will fit the 170 and 198 also In 1975 an aluminum intake manifold PN 3837608 for the one barrel was introduced on the Feather Duster package In 1977 the Super Six two barrel package was introduced This package has an aluminum two barrel manifold PN 4095066 and two barrel carb PN 4027721 This is a standard type Carter two barrel with 1 44 throttle bores The problem with the 2 BBL intakes listed in this section and early ones is that they are not available Ordering the number listed gets you a superseded manifold made of cast iron The 2 BBL intake that you want to order is D C part number P4286781 The carb 2 BBL to use with this manifold is PN P4286782 This package is also the best for dual purpose performance Larger two barrels should be used for higher performance before the 4 BBL is installed for all out racing H Camshafts and Valve Gear The 71 77 camshaft 244 degree duration 410 lift is a good choice for the older engine which had only a 232 degree duration 400 lift cam No other special pieces would be required The next step up would be the Hyper Pak cam 276 degree duration 430 lift which is borderline for driveability even when used with a manual transmission and a high numerical axle ratio The Hyper Pak cam is not recommended for use with an automatic transmission The H D valve springs from a 340 PN 2863439 are required with th
35. is camshaft It also is very difficult to obtain We recommend the next step because it offers more performance with less duration The next step up in hot rod camshafts is the PN P4286679 which is a 268 degree duration 460 lift design This is a good cam for general high performance applications with a high numerical axle ratio The 340 valve spring should be used with this cam also The race cam for the slant six that is carried by the D C Program is the PN P4286681 which has a duration of 276 degrees and 490 lift This cam should use the new high performance spring PN P3614542 or P3412068 These last two 6 cylinder cams are brand new designs and represent the highest state of camshaft development to date Most 6 cylinders aren t going to be in need of any bigger cams but they are available It appears that the Racer Brown ST 21 STX 21 and STX 22 should perform well in fully modified engines Racer Brown pushrods retainers valve springs and so on should be used No slant six dynamometer work has been done at Chrysler with these cams but these cams have produced power very well in the Chrysler wedge head V 8 s The STX 21 has a 560 lift while the STX 22 has 590 lift If in doubt use the smaller D C profiles listed above 1 Retainers d Keepers The standard steel retainer can be used with the standard type springs such as the 340 An aluminum retainer PN P3412067 can also be used with these springs This aluminum retainer can a
36. is covered in an earlier section The all out Super Stocker should use not only the electronic ignition distributor but also the Multi Spark conversion as well NHRA IHRA Legal Specifications Min Max Head Engine Head Dock Milling Disp Vol Height Spec s 1960 Hyper Pak To reduce the chamber 1963 71 225 53 8 141 volume remove 0066 1970 71 198 53 8 edanak from the head surface 1963 71 170 53 8 000 per icc of chamber 1972 71 198 54 0 075 volume 1972 75 225 54 0 140 1976 83 225 54 0 115 Dome displacement 13 7 cc C IHRA AHRA Formula Stock Racing A two barrel manifold with carb should be installed along with a set of headers The camshaft should be a D C P4286681 276 degrees The good valve job and a 090 head mill to approximately 45 cc should be done and the 340 valve springs installed The electronic ignition system should also be used It is important to build a good deep sump oil pan and modify the oil pump pick up We also recommend installing a windage tray A fresh air hood scoop should be added It is important to seal the carb to the head scoop See Figure 2 11 NOTE THIS MODIFICATION IS FOR HOLLEY CARB P369093 m egn IS FOR HOLLEY CARB P3690930 ONLY 3 4 5 6 hate N A y Primarios Dams In Floor 1 8 High Secondary FIGURE 21 1 6 CYLINDER 4 BARREL D Sportsman or Circle Racing The 1 2 mile or so circle racing groups have many different rules but
37. jetted for proper fuel distribution The intake manifolds mentioned above can be used with different carburetors after market manifolds or the manifold heat blocked all of which require the carb to be jetted differently for each application The following sections will cover the more popular choices SPECIAL NOTE Because of the constant changes that occur in racing the latest up to date carburetor and intake manifold information for the racing packages is covered in Chapter 21 2 Single Barrels Any 170 cu in slant six having a small BBS carburetor 1 1 4 diameter venturi will produce about 5 more power when the 225 cu in BBS carburetor 1 11 32 diameter venturi is installed These two carburetors can be identified by measuring their throttle bore diameter The larger carburetor has a 1 11 16 diameter throttle bore and the smaller carburetor has a 1 9 16 diameter throttle bore All 170 manual transmission jobs and the 1960 1961 170 with automatic transmission have the smaller carburetor 3 Two Barrels a Two Barrel Conversion Available from Mopar A two barrel setup as used on the 225 cu in export and marine engine is available from Mopar as follows Intake Manifold PN 2806816 Carter 2 Bbl Carb PN 3462779 1 44 throttle bore Air Cleaner PN 2465310 b Do it yourself Two Barrel The two barrel carburetor from any 318 V 8 engine without CAP package can be used as shown in Figure 2 3 It is larger and shouldn t need to b
38. l for Stock and Super Stock racing the full radius or multi angle valve job see Figure 2 5 is a performance improvement over the standard valve job Ideal Valve Face And Seat Widths Seat Should Center As Near As Possible On Valve Face Seat widths Face widths Exhaust 05 01 Intake 09 01 Intake 07 01 Exhaust 10 01 7 CYLINDER HEAD Valve 0 A LM d Seat Reconditioning Grind Valve Faces and Seats to 45 Runout Not To Exceed 002 FIGURE 2 5 For NHRA stock or super stock valve job the following rules apply The valve must be faced at factory specification angle and the seat angle must also meet factory specs The valve seat may be narrowed from the top with any angle less than the seat angle but not to exceed 1 4 inch larger than the valve head see diagram The maximum width for valve seat and bottom cut may not exceed 1 4 inch when measured together top of seat to bottom of cut See Figure 2 6 Not over 1 4 larger than valve head J Bottom Cut 70 degrees C 1 4 Max FIGURE 2 6 4 Bracket Valve Job In class racing SS A F S B SM etc there are very specific rules regarding valve work and seat modifications In bracket racing however there are no rules regarding valve grinding Therefore we can have a special bracket valve job sometimes referred to as a competition valve job The valve part is relatively easy Production wedge valves have a small ski j
39. ler 340 106 310 872 620 638 104 035 2035 A Eng P4120977 Mod Prod Roller 340 109 323 330 690 630 107 035 035 B Eng P4286673 D C 248 114 248 20 410 112 Zero B Eng P4286675 D C 260 113 260 34 430 110 Zero B Eng P4286677 D C 272 112 272 48 455 108 Zero B Eng P4286631 D C 280 110 280 60 474 106 Zero B Eng P4349268 D C 324 106 324 620 104 028 032 P3690588 Mini Express 107 316 654 107 024 028 B Eng P4349270 D C 328 107 328 x 690 107 024 028 B Eng B Eng Hemi Hemi Hemi Hemi Hemi P4 P4 P4 P4 P4 P4 P4 34 34 34 34 34 34 34 9249 9247 9259 9257 9251 9253 9255 TZ GO GO b KA DO WN tock Cheater Hyd 108 uper Stock Roller 108 78 Hyd 108 92 Hyd 108 tock Cheater Hyd 106 uper Stock Roller 106 ro Stock Roller 114 324 278 292 3 33 328 344 Stock 90 495 480 2524 4507 Stock 785 747 700 106 106 104 104 104 104 114 Zero 035 Zero Zero Zero 032 028 035 032 030 Racing Carburetor and Manifold Calibrations A most difficult thing in racing engine development is to understand fuel distribution among the cylinders and get it correct in the engine at the race track Fuel distribution is also an area where small changes can result in big gains or big losses The only accurate way to determine what these small changes should be is to use a dynamometer with mixture le
40. lso be used with the race valve springs An Apollo titanium retainer PN P4007178 can be used for race competition If required there is a 3 8 stem lash cap P3690763 that can be used There are three designs of lock grooves used on valves There are hardened valve stem locks or keepers available for each design for the 3 8 stem slant six valves 1 Groove P3690797 2 Groove P3690856 3 Groove P3690857 2 Pushrods The standard 170 and 225 mechanical lifter pushrods are acceptable for most purposes If the block and heads have been milled excessively the length of the standard pushrods may be unacceptable If this is the case or a custom length pushrod is desired the pushrod kit PN P4007284 which will make 16 pushrods 4 extra is recommended Individual replacements which will make one pushrod are available under PN P3690988 Total of 12 required no tool included 3 Degree Bushing The B RB engines use a pin in the end of the camshaft to locate the cam in relation to the cam sprocket By using offset bushings package of 4 PN P3690936 inserted into the sprocket the installed centerline of the camshaft can be changed advanced or retarded 4 Timing Chain For heavy duty use there is a roller timing chain setup available Cam Sprocket P4007715 Crank Sprocket P3690280 Roller Chain P3690279 5 Viton Valve Seals The viton valve seals P4120492 are sold as a package of sixteen 8 intake and 8 exhaust Only 12 used on 6 T
41. most have a special class for the 6 cylinder engines Where the rules allow the top two barrel carb the above Formula Stock package will work well The top ring gap should be on the high side 015 and a special oil pan and pickup will have to be used The P4286681 cam the 340 race type valve springs and pushrod kit should be used along with Gold Box P4120600 ignition system E IMSA Sports Car Racing The IMSA Sports Car Series for small lightweight compact cars accepts the 225 Feather Duster Dart Light as legal packages for this class The 225 engine with 4 speed transmission would make a very competitive car in this class using much of the Chrysler Kit Car science F Bracket Racer In Bracket Racing low cost and reliability are very important Here the slant six really shines The two barrel and the P4286779 cam make a good racer package The electronic ignition and the windage tray are also recommended Refer to the latest Direct Connection catalog s 6 cylinder section for more bracket racing tips or Chapters 31 amp 33 later in this book G Four Speed Manual Transmission Installation There is a lot of interest in installing the Chrysler four speed behind the slant six The original pieces used in 64 66 slant six four speed packages are no longer available but the 75 77 pieces will work fine The bellhousing PN 3743645 will accept the A 833 Chrysler 4 speed but it has a very large transmission pilot diameter The 340 transmission
42. om Chrysler but can be purchased from Melling Tool Co P O Box 37 Jackson MI 49204 Their part no is RPD 3 The hydraulic cam and lifters were introduced in 1981 The cam is PN 4105275 It uses a different valve gear than the mechanical cams High performance cams are covered in a later section H Sprockets amp Chain All the slant sixes use the same timing chain and sprockets The timing chain is PN 3514866 crank sprocket is PN 2128912 and the cam sprocket is PN 2806945 These pieces are not for a roller chain design There is a special set of pieces to convert the slant six to a roller chain system cam sprocket P4007715 crank sprocket P3690280 and a roller timing chain P3690279 J Connecting Rods Each displacement slant six engine has its own connecting rods The 170 rod PN 1947165 has a 5 707 center to center distance The 198 engine has the longest rod with a center to center distance of 7 006 and is PN 2951262 The 225 rod PN 2406657 has a center to center distance of 6 699 The 225 cast crank engine uses a unique connecting rod PN 4041994 The two rods for the 225 are not interchangeable K Rod Bolts and Nuts All slant six connecting rods use 3 8 bolts and nuts A hi strength steel 3 8 bolt P3614521 and nut P3690632 are available for all the slant six connecting rods or obtain the complete package Bolts amp Nuts P4120090 Rod bearings come in two materials F 77 Tri Metal recommended for oval track race c
43. on parts crankshaft rods pistons for dragstrip use Production balance tolerances are more than adequate A race engine should be balanced 6 Head Gasket If trouble is experienced with blowing head gaskets in modified high compression engines a steel head gasket PN P4286789 60 80 is also available A composition gasket P4286790 81 84 is also available The comp gasket will fit on the older engines and is recommended for gasket sealing problems 7 Stroking The only production part available to stroke the six is in the installation of the 225 crank into the 198 engine This requires the 225 crank and rods Likewise any specially made stroker crank will also require either special rods or special pistons or both The assembly should be rebalanced 8 Honing Plates For the serious all out race engine honing plates are recommended Honing plates from other engines like the A or Hemi won t work on the slant six engines because the head bolts are located in the wrong place Honing plates for the slant six engines are not readily available at this time L Exhaust System The special exhaust pipe muffler and exhaust manifolds from the Hyper Pak six are no longer available 1 Mufflers and Pipes The exhaust system from the 75 76 Feather Duster and Dart Light is the best system currently available The large dia pipe from the manifold to the converter is PN 4004379 The catalytic converter and pipe assembly is PN 4004147 w
44. ondary jet with No 120 181 0492 c Replace the choke side secondary jet with No 120 365 065 Modified Standard Manifold The above carburetor is also used with this manifold and should be installed with the primary throttle bores towards the front of the car The carburetor should be modified as follows a Replace metering rods with No 16 177 067 0655 064 b Replace primary jets with No 120 386 086 This calibration may be too lean for a highly modified engine in which case a richer mixture should be used 5 Four Barrel Carburetor for all Slant Six Engines A carburetor that gives proper fuel mixture and distribution characteristics for the six cylinder engine using a Hyper Pak intake manifold or a modified standard intake manifold can be made from a Carter model 3854 S carburetor This carburetor is used on the 1965 and later 273 cubic inch high performance engine The modifications are as follows a Replace the metering rods with No 16 177 rods 067 065 055 Dia b Replace the throttle side secondary jets with No 120 181 jets 049 Dia c Replace the choke side secondary jet with No 120 386 jets 065 Dia d Replace the pump jet clusters with cluster No 48 264S The throttle linkage will have to be fabricated to match the installation Special Note We only recommend the 4 BBL package for racing 6 Carb and Manifold Update In the last couple years several new intake manifolds and carburetors have been
45. ons In 1975 the latest head was introduced and has casting no PN 3698444 1 The casting numbers can only be used to identify the heads The following chart shows the 64 and newer six cylinder heads and the part numbers that they can be purchased under Head Casting Year Number Service Number 64 66 2206035 2463476 67 74 2843169 2843819 72 73 3614850 3671636 with air injection 72 74 3698995 3671476 75 7 7 3698447 3830329 78 3698447 3698448 79 80 4104362 4095776 81 83 4095778 4095776 4104363 Both service heads PN 2463476 and PN 2843819 have been superseded by PN 2847116 This new casting no longer uses the spark plug tubes It also uses the small BL series spark plugs and the tappets can t be removed with the head installed on the engine D Valve Cover All slant six valve covers are interchangeable The 1974 77 valve cover PN 3769672 has remained unchanged There is a chrome valve cover P3690742 60 80 available that fits all slant sixes The 81 82 cylinder head changed and caused the valve cover on the 81 82 engine to change shape They are not interchangeable The chrome 81 84 valve cover is PN P4120930 1 Valve Cover Accessory Package P4120272 Package comprised of 12 chrome plated screw and washer assemblies 1 chrome plated oil filler cap 2 rubber grommets 2 Chrome Breather Cap The final touch for your chrome valve cover P4120446 Chrome Breather Cap E Main Bearings Crank m
46. pring PN P3412068 or P3614542 or other race type valve springs the inner spring seat needs to be narrowed and also its height of the guide needs to be cut down See Figure 2 9 for details It is also recommended that for the high lift cams such as the Super Stock roller cams that the stock valve guide height be shortened by 100 For Super Stock and fully modified drag race only engines valve seals are not used but the valve guide clearance is decreased to 001 on both intake and exhaust valves Reduce O D of Inner Spring Seat for Racer Brown 957 ABC Springs _ Shorten guide for high lift cams For R B STX21 Camshaft FIGURE 2 9 VALVE SPRING SEAT amp PORT MODIFICATIONS K Short Block When assembling a slant six engine most of the miscellaneous small parts such as cam bearings timing chain and sprockets rear main seal camshaft plug and freeze plugs are the same between the various engine sizes When reassembling your short block you ll need a variety of Plastigauge P4286819 to measure bearing clearances This popular assortment includes one blue strip for 004 009 tolerances two red strips for 002 006 tolerances and two green strips for 001 003 tolerances Each strip is 12 long A chemical kit belongs on every mechanic s work bench for life s mechanical frustrations like baked on gaskets and for assuring proper seals for assembly lubing freeing up nuts and dozens of other uses Eleven separate ch
47. regulator and if it is not used the control box will be burned out A good ignition is only as good as its spark plug wires There are two types of high performance spark plug wires available metal core and suppression The suppression wires PN P3690806 are a good choice for a general high performance car A race car must use solid metal core wires P3690805 to obtain the high rpm performance required The spark plug wires should not be crossed one over the other anywhere between the distributor cap and the plugs Use ignition wire separators PN P4007667 to keep the wires from crossing or getting too close to each other The wires should be kept away from any metal object If the plug wires do get near metal such as the valve cover then more insulation should be added in the area of contact These tips on plug wires must be followed if the high energy ignition systems such as the Gold Box P4120600 are to be used A new lightweight battery in the trunk kit PN P3690934 is available and a good investment for a bracket racer For racing or other high performance applications with a modified non stock engine it may be necessary to use a spark plug which is one or two steps colder than standard Colder than standard plugs used under normal type driving conditions will provide short plug life as they are more likely to foul If plug fouling is experienced with a high performance two or four barrel engine under normal conditions a warmer plug may be n
48. s oversize inlet valve Outdated info see below Oversize Intake and Exhaust Valves Update The two paragraphs above list oversize valves from older Chrysler engines These work fine but may be very hard to find today This can be solved by using D C intake valve P4286785 which has a 1 70 diameter and exhaust valve P4206786 which has a 1 44 diameter No bore notch is required with either of these valves 2 High Flow with Standard Valve Diameters Oversize valves are expensive and involve much more work bigger cuts etc In many cases the racer is looking for more performance but without the added expense and extra grinding High flow standard diameter valves are ideal for this application Intake P4286783 Exhaust P4286784 They are interchangeable with the stock ones but they re backcut to help flow more air which helps increase horsepower 3 Valve Grinding The intake and exhaust valve seats and the intake valve face have a 45 degree angle The exhaust valve face has a 43 degree angle The concentricity of the valve seat should be measured using a dial indicator Total runout should not exceed 002 total indicator reading The width of the intake seats should be 060 to 090 The exhaust seat width should be 045 to 060 It must be remembered that the further the valve seats sink into the ports the less horsepower the engine will produce Never sink the valves to equalize the combustion chamber volumes Although it is not lega
49. s which will provide increased power and durability We will look at the various systems separately first and then tie these systems together into the various complete race engine packages A Ignition System Chrysler s new electronic ignition system which was introduced on the slant six engine in 1973 is the best ignition system available The vacuum advance model electronic ignition conversion package PN P3690789 for the slant six includes a distributor PN P3690788 control box PN P4120505 wiring hamess and ballast resistor The next level up for higher rpm race cars is the chrome box system P4120534 box The highest output system currently available for race cars is the gold box P4120600 which is designed to offer the performance of other race ignitions see later section with more reliability and for less expense See Chapter 19 The H P electronic distributor does not need to be recurved since it has a race advance curve built into it The race electronic distributor with the vacuum advance is recurved to have full advance by 2000 rpm which is more suited to general high performance use The maximum total spark advance for the slant six engines should be set to 32 degrees The damper should be clearly marked for both TDC and 32 degrees advance All electronic ignition systems both standard and multi spark require a special voltage regulator PN P3690732 when installed on the 1969 and earlier cars This is a constant output voltage
50. tch Driving Disc 1636570 Gasket Exhaust Pipe Flange 2298350 Assy Muffler amp Exhaust Pipe NOTE These part numbers are given for reference only The actual parts are no longer available B 1975 76 Feather Duster and Dart Light 225 This package was specially designed for fuel economy The engine part of the package consist mainly of an aluminum intake manifold and low restriction exhaust system based around a larger diameter header pipe The body part of the package featured lightweight aluminum panels The chassis also had special items such as a four speed overdrive transmission C 1977 Super Six The super six is the latest package on the slant six It consists of a two barrel carb and special aluminum two barrel intake manifold THE SLANT 6 V RACING ONLY PACKAGES Now that the individual systems and special parts have been covered we can try to put them together into a complete engine package to go racing Be sure to refer to earlier sections for further details A NHRA Stock Stock Eliminator is the best place to race the slant six in class type racing The best classes are U V W X S The fuel system should be one Carter electric fuel pump PN P4007038 at the rear and one standard mechanical pump on the engine The oil system should use the stock pan with an acceleration baffle added along with the windage tray set 1 8 from the rod bolts and crank The high output electronic ignition is the best ignition for racin
51. ter link dropped or reshaped so that the tube through the pan is not required Any reshaping or changing of the center link should be done carefully so that the relationship of the end holes is not changed at all If one of these points is moved it will change the toe pattern of the front suspension which could be very dangerous in a drag vehicle The two baffles shown in Figure 2 2 should be sealed on the three sides next to the actual pan sides No oil should be able to pass between the baffle and the sides of the pan or the effectiveness of the baffle is greatly reduced The swinging pickup is available from Milodon in Van Nuys California The oil sump should be designed so that the swinging pickup can swing to the rear of the pan on acceleration and to the front of the pan on deceleration The pickup should stop within 1 2 of the back and front of the pan sump The sump should be filled with six to eight quarts of oil Note Before installing any parts in engine make sure that they are free of welding scale dirt or any other foreign matter Refer to the oiling system Chapter 18 for further information E Fresh Air System A good fresh air system can increase a car s performance without affecting much else A hood scoop such as that used on the 1969 Road Runner or Super Bee 440 6 bbl PN P3412057 scoop only can be attached to your standard hood The air cleaner should be modified so that it is sealed to the hood Foam rubber can be us
52. to prevent rotation The oil sump should be greatly enlarged so that the oil level is at least six inches below the crankshaft s path At least six quarts capacity is necessary as shown in Figure 2 1 The oil pickup should be converted to a swinging type unit The parts to use are PN 2406678 and PN 2406679 The swinging pickup enlarged sump system should have proper baffles that will enable the pickup too stay covered under acceleration and deceleration We strongly recommend using the high capacity oil pump P4286740 in all high performance applications P gt Rods amp Crank See Figure 2 2 FIGURE 2 1 In a high mileage extreme serviced engine you may experience rear main bearing oil leakage This problem can be solved easily by installing these specially engineered bearings The bearings feature special diagonal cut grooves to prevent leakage at the rear main P4349040 Slant Six 1960 76 with Forged Crank P4349041 Slant Six 1976 84 with Cast Crank The Direct Connection filter P4007513 is engineered to meet the demands of heavy duty and high performance applications and is recommended for all engines Oiling Tip use nylon insert oil pan screws P4120613 pkg D Full Race Oiling System The race oil pan should be designed similar to Figure 2 2 The first item to check before building a race pan is to determine the lowest point of the connecting rod travel and the relationship of this point to the pan rail The dimensions
53. ump on their backside just below the seat itself The backcut removes this see Figure 2 7 LEGAL NHRA VALVE JOB T Backcut Valve FIGURE 2 7 Backcut angles vary from 20 to 35 degrees depending upon the engine Backcut valves are available for the 6 cylinder engines see section 2 Backcutting the valve tends to make the valve seat narrower for which we strongly recommend that bronzewall valve guides be installed in the head Modification of the valve seat in the head is not as easy to explain The valve seat itself is 45 degrees standard The throat or approach angle is 70 degrees but sometimes 65 degrees is used because the orbital grinder used to grind the seats occasionally will chatter at 70 relatively speaking the 70 degree cut in the throat removes a lot of material which leaves a sharp edge at the bottom 70 degree machine cut as it transfers to the as cast port See Figure 2 8 4 Valve Seat Centerline Blend Here Smooth Radius y Cut FIGURE 2 8 This sharp edge should be removed very carefully with a hand grinder so that it blends smoothly into both the cast port and the 70 degree machined cut It is very important to keep to a minimum the metal removed and to maintain the 70 degree cut although it may be narrower than it was originally Extra caution should be used on the port s short side to keep as much radius as possible 5 Valve Guide Cutting To install the dual valve s
54. vel analysis on each cylinder The purpose of this tune up manual is to relay to the racers the fuel distribution information accumulated over the years from Chrysler dynamometer development programs Fuel distribution is the cylinder to cylinder variance in fuel air ratio It is desired that the cylinder not be too lean or too rich and that all the cylinders be the same fuel air ratio through the engine speed range It is obvious from this that the carburetor and intake manifold work as a team A stock carburetor that works well on a stock manifold may not work well on a race intake manifold A race carburetor that performs well on arace manifold may perform poorly on a stock manifold In most cases drag racing requires certain changes to be made to any carburetor and special manifold modifications to go with the carburetor that is to be used These modifications have been determined on the dynamometer for the best overall engine output for Super Stock Modified Production and Bracket racing The most popular racing packages with the commonly available manifolds will be covered by engine family i e 6 cylinder LA engine B engine RB engine and Hemi This revision supersedes all previous information This bulletin represents the latest developments that our dynamometer and drag strip testing have shown to work Many carb manifold packages are left in for reference only It s the latest information that we may have on an out dated package A C
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