performer rpm twin cam®cnc-machined
Contents
1. Page 2 of 5 rocker cover bolts A through F Figure 2 Rocker Cover Bolts 2007 Edelbrock Corporation Brochure 63 0289 3 Remove the rocker cover and gasket 10 Remove the rocker housing and gasket 4 Rotate the engine so both valves are closed on the head being CAUTION removed 5 See Figure 3 Remove the two breather cover bolts G amp H remove breather assembly and place in a plastic bag 6 Following the pattern shown in Figure 3 loosen and remove the four rocker arm support plate bolts through L Loosen head bolts gradually in the pattern shown in Figure 5 to prevent distorting the head cylinder and crankcase studs 11 See Figure 5 Loosen each head bolt S thru V 1 8 turn Figure 5 Head Bolts 12 Continue loosening in 1 8 turn increments until bolts are loose Figure 3 Breather Cover amp Rocker Support 13 Remove head bolts 14 Remove cylinder head 15 Remove cylinder head gasket 16 Remove the two o rings from the cylinder head dowels Note big bore engines 95 cid do not use these o rings 17 Repeat steps 1 through 16 for the other head 7 Remove the rocker arm support plate assembly from the rocker housing and place in plastic bag 8 Remove the two pushrods and discard These must be replaced with adjustable pushrods Remove pushrod cover assemblies CAUTION The upper cylinder dowel o ring H D P N 11273 is only used on stock bore2. Windex etc REPLACEMENT ITEMS Page 5 of 5 Replacement Items seats Intake Standard 0 D 9262 002 0 D 003 0 D 010 O D Guides Intake Standard 0 D 1628 001 0 D 1629 002 0 D 1630 003 0 D 1631 030 0 D 1632 Exhaust Valve Intake Valve Valve Seals set of 4 Valve spring retainer amp lock kit Exhaust 9261 9287 9288 9268 Exhaust 1633 1634 1635 1636 1637 The words Twin Cam Evolution Harley and Harley Davidson are registered trademarks of Harley Da vidson Inc Milwaukee Wisconsin USA and are used in this instruction sheet for reference only 2007 Edelbrock Corporation Brochure 63 0289 Edelbrock Corporation e 2700 California St Torrance CA 90503 Tech Line 800 416 8628 e E Mail Edelbrock Edelbrock com
3. 88 cid cylinders If your motor has been bored to 95 cid do not install this o ring on the upper cylinder dowel Use gasket kit P N 3155 on big bore 95 cid cylinders 9 See Figure 4 Remove the six bolts M through R holding the rocker housing to the cylinder head Cylinder 2 Cylinder head 2 Valve 1 intake 1 exhaust Valve seat 2 Valve guide 2 Lower collar 2 Valve stem seal 2 Outer valve spring 2 Inner valve spring 2 Upper collar 2 Valve keeper 4 Cylinder head gasket O ring and insert 2 Cylinder base gasket Head bolt long 2 16 Head bolt short 2 Only 1 used on Big Bore 95 cid cylinders SA OT a Se e 13 Not Used on 95 Inch Motors Figure 4 Rocker Housing Figure 6 Cylinder Head Parts and Cylinder Catalog 1694 1697 3020 3024 3049 3080 3187 3188 2007 Edelbrock Corporation Rev 3 07 RS mc Page 3 of 5 Brochure 63 0289 HEAD GASKETS e You must use the correct head gaskets to achieve the correct compression ratio for best power Thicker gaskets will lower compression and power and thinner gaskets will raise compression higher than advisable for use with today s unleaded pump gasoline 1 Use Edelbrock gasket set 3155 This set includes the proper thickness head gaskets 045 and the special intake manifold gaskets required for these cylinder heads 2 You may use standard Harley Davidson head gaskets P N 16787 99 if desired They vary i
4. following procedures STRIPPING ENGINE 1 Using a suitable motorcycle lift raise the motorcycle until the rear wheel is off the ground 2 Remove seat 3 Remove instrument cover Softail and Dyna Glide models 4 Drain fuel tank Disconnect fuel line and plug end of fuel line with 5 16 bolt Use a 1 4 bolt and rubber cap to plug fuel line crossover Disconnect any wires and vacuum lines from tank Remove fuel tank Catalog 1694 1697 3020 3024 3049 3080 3187 3188 Rev 3 07 RS mc WARNING Gasoline is flammable and fumes are explosive To avoid possible personal injury drain gasoline in well ventilated area away from fire or flame Drain gasoline into approved gasoline container only 5 Remove upper cylinder head motor mount or stabilizer assembly from cylinder heads Do not loosen stabilizer jam nuts 6 Remove spark plugs 7 Remove exhaust system 8 Remove air cleaner cover filter element and back plate 9 Remove fuel hose from carburetor 10 Loosen throttle cable adjusters remove carburetor from manifold and disengage throttle cables from carburetor 11 Unplug MAP sensor wire harness at intake manifold 12 Remove intake manifold flange bolts and remove manifold REMOVING CYLINDER HEADS 1 See Figure 1 Remove two spring cap retainers on pushrod covers and collapse upper and lower pushrod covers Figure 1 Pushrod Tube Spring Clip 2 Following the pattern shown in Figure 2 loosen and remove the six
5. 28 1783 Mount Stock Using 72cc Heads Stock Using 88cc Heads e IMPORTANT NOTES BEFORE BEGINNING INSTALLATION 1 Itis highly recommended that the installation of Performer RPM Twin Cam cylinder heads be performed by a qualified engine builder with experience in high performance or racing modifications to Harley Davidson engines 2 Prior to installation it is mandatory that valve to piston clearances are checked and corrected to minimum specs if necessary These heads have larger than stock valve sizes and will not work with the valve pockets in stock pistons The use of aftermarket pistons such as Edelbrock JE pistons and or custom machining to your pistons is required Actual valve to piston clearance should be specified by your camshaft manufacturer 3 Prior to installation it is mandatory that valve to valve clearance is checked to determine if these heads are compatible with the camshaft you intend to run This procedure is outlined on the following page Catalog 1694 1697 3020 3024 3049 3080 3187 3188 Rev 3 07 RS mc Page 1 of 5 4 Due to a higher rocker arm mounting pad dimension the use of adjustable pushrods is required Stock pushrods will not work even with mild camshaft profiles 5 Check valve spring retainer to rocker box clearance before installation It is frequently necessary to machine or grind the rocker box to achieve the recommended 050 clearance D If additional milling of the heads i
6. PERFORMER RPM TWIN CAM CNC MACHINED CYLINDER HEADS FOR FUEL INJECTED amp CARBURETED TWIN CAM ENGINES Catalog 1694 1697 88cc Catalog 3020 3024 3049 3080 3187 3188 72cc INSTALLATION INSTRUCTIONS PLEASE study these instructions carefully before beginning this installation If you have any questions or problems do not hesitate to call our Technical Hotline at 1 800 416 8628 or e mail us at Edelbrock Edelbrock com e DESCRIPTION Performer RPM Twin Cam CNC ported aluminum heads are the ultimate heads for high performance power in 88 inch and larger Twin Cam 88 engines They provide superior flow for maximum horsepower and torque These heads are completely CNC ported in all critical areas combustion chamber intake port and exhaust port The patented design of Edelbrock cylinder heads U S Patent 5 671 709 and 5 598 820 along with this CNC porting work together to provide more efficient combustion and awesome horsepower Performer RPM Twin Cam CNC ported heads come with high grade stainless steel swirl polished valves 1 940 intake and 1 625 exhaust ductile iron seats and guides 1 460 0 D valve springs teflon valve stem seals titanium retainers locks and a three angle valve job They accept up to 650 max valve lift They are cast out of 356 aluminum and heat treated to T 6 specs Performer RPM Twin Cam CNC ported heads have a 72cc combustion chamber This chamber size will produce a 9 5 1 compression ratio wi
7. equipment head bolts and studs for your year vehicle to ensure proper torque and head gasket life See Figure 8 With a torque wrench start at the cylinder head bolt numbered 1 and tighten to 7 9 ft lbs Then tighten 2 3 and 4 in order to 7 9 ft Ibs Following the torque sequence tighten each bolt to 12 14 ft Ibs See Figure 9 Mark a line on the cylinder head and a corresponding line on the head of the cylinder head bolt as shown in View A Following the same sequence 1 2 3 then 4 turn each bolt one at a time one quarter turn 90 using the marks as a guide When marks are all positioned as in View B the procedure is completed IO 30 Front cylinder 2Q 40 20 40 Rear cylinder 1Q 30 Figure 8 Cylinder Head Bolt Torque Sequence Figure 9 Tighten Head Bolts 2007 Edelbrock Corporation Brochure 63 0289 quality torque wrench PUSHROD INSTALLATION NOTE Adjustable length pushrods must be used Follow manufacturer s recommendations for pushrod installation and adjustment Rotate the engine so that both lifters of the cylinder being serviced are on the base circle lowest position of the cam See Figure 1 Install pushrod covers and associated parts using new O rings Install pushrods NOTE Be sure to use new O rings on pushrod tubes to prevent leaks Also check carefully to be certain old O rings were removed from pushrod tubes and lifter bores Install cylinder head rocker hous
8. ing gasket note position of breather channel and orientate gasket correctly Place rocker housing in position Install the six bolts and washers that secure the housing Slowly snug rocker housing fasteners in small increment one at a time in the alphabetical order see Figure 4 Tighten the bolts to 10 14 ft Ibs Install o ring in groove around breather hole Catalog 1694 1697 3020 3024 3049 3080 3187 3188 Rev 3 07 RS mc 5 Install the rocker arm support plate Figure 3 Tighten the four bolts in 1 4 turn increments to 15 18 ft lbs following the alphabetical pattern D Install the breather cover assembly Figure 3 Tighten the two bolts to 90 120 in Ibs 7 Install the rocker cover gasket and cover Figure 2 Tighten the six bolts in 1 4 turn increments to 9 12 ft lbs following the alphabetical pattern 8 Install the Air Temperature sensor and reconnect the sensor plug 9 Install intake manifold per the instructions included with it Tighten manifold bolts very carefully using Locktite 242 non permanent thread locker to prevent loosening 10 Install the carburetor air filter and exhaust components 11 Re assemble all components removed during disassembly connect battery cables and re fuel gasoline tank 12 To prevent discoloration when the engine reaches operating temperature carefully wipe off grease fingerprints stains etc from all chrome and polished surfaces with a lint free cloth and alcohol
9. n thickness so it is advisable to measure your gasket before use Recommended thickness is 045 CYLINDER HEAD INSTALLATION CAUTION See Figure 7 On 88 cid cylinders install new O rings over the cylinder dowels before installing the head gasket Install the O rings first to ensure alignment of the head gasket and prevent gasket leaks On 95 cid cylinders install the new head gasket directly over the cylinder dowels Figure 7 88 cid Cylinder O Rings and Inserts CAUTION Use only original equipment specification head bolts and other hardware All original hardware is hardened grade 8 material which is required for proper performance of these parts 1 Puta few drops oil on head bolt threads and bottom face of bolt head then wipe off any excess Install the head bolts 15 amp 16 Figure 6 finder tight 2 See Figures 8 amp 9 The procedure for tightening the head bolts is extremely critical not only to prevent gasket leaks but to prevent stud failure and heads and cylinders distortion CYLINDER HEAD BOLT TORQUE SEQUENCE CAUTION Be sure you thoroughly clean and lubricate the cylinder head bolts before tightening to the correct torque Friction because of dirt or grime will cause the torque wrench readings to be incorrect Screw the bolts onto the crankcase studs by hand to be sure there is no friction Catalog 1694 1697 3020 3024 3049 3080 3187 3188 Rev 3 07 RS mc Page 4 of 5 CAUTION Use only original
10. s desired remove approximately 0065 for each 1cc reduction This is only an approximate number you must stop and measure the chamber size before the final cut to be sure your rate of removal is correct TWIN CAM 88 B MOTOR LIMITATIONS The Twin Cam 88 B motor used in 2000 and later Softail models has a pair of balance shafts that are chain driven from the pinion shaft This engine has a design operating limit of 6 000 RPM Operating a B engine above 6 000 RPM can result in severe engine damage 2007 Edelbrock Corporation Brochure 63 0289 CHECKING VALVE TO VALVE CLEARANCE 1 Before installing heads on engine remove valve springs retainers and locks from one head Leave the valve seals on to hold the valves in position during the clearance check Use a 6 caliper to measure valve tip height from the valve spring pocket Find the cam manufacturers Valve lift at Top Dead Center specs and subtract this dimension from the valve tip height you measured in step 2 Using the calipers to check the new valve tip height open the valve by the amount calculated in step 3 Repeat this process for the other valve Note that intake and exhaust Valve lift at Top Dead Center dimensions are usually different With both intake and exhaust valves open to the correct specifications use a 060 feeler gauge to check clearance between the valve heads If less than 060 clearance exists you run the risk of valves hitting d
11. th 88 cid and 10 25 1 compression ratio with a 95 cid with flat top piston Matching Edelbrock JE forged pistons are recommended for higher performance applications e These heads feature a rectangular shaped intake port for a noticeable increase in air flow This 125 raised rectangular intake port also helps to increase the velocity of the incoming air for more power Edelbrock intake manifolds must be used with these heads because of the unique port shape see application chart below The dual quench combustion chamber features a revolutionary new design that directs the air fuel mixture into a tumbling and swirling motion for a better mix and more efficient combustion When used with the listed engine sizes and head gasket thickness recommended 045 nominal compression is raised to 9 5 1 on the stock bore 88 cid engine and 10 25 1 on big bore 95 cid engine The D shaped exhaust port provides a larger area for increased flow It was designed to create a mismatch between the exhaust pipe and the exit which reduces power robbing exhaust gas reversion INTAKE MANIFOLD APPLICATION CHART PERFORMER RPM TWIN CAM HEADS Carbureted Applications Spigot S amp S 6 Mount 46mm Mikuni 3120 3121 3122 1780 1781 1782 Electronic Fuel Injection Applications NOTE All Edelbrock 95 Twin Cam Electronic Fuel Injection Power Packages Use Intake Manifold 1768 Cyl Flange Length 45mm Mikuni 44mm CV 3123 1784 sas 31
12. uring engine operation voiding any warranty on these cylinder heads If there is less than 060 clearance select another cam for your engine EDELBROCK JE SPORTSMAN PISTONS Edelbrock JE Sportsman forged aluminum big bore pistons 3 7 8 increase the displacement to 95 cubic inches These pistons have a 10 25 1 compression ratio with the Performer RPM Twin Cam heads Edelbrock JE Sportsman forged pistons are the best pistons to use for high performance applications Available in big bore 3 7 8 005 010 and 020 bore sizes ADJUSTABLE PUSHRODS Adjustable pushrods must be used with Edelbrock Performer RPM Twin Cam cylinder heads We recommend the Harley Davidson Screamin Eagle Quick Install Pushrod Kit P N 17997 99A This kit includes special pushrod tube assemblies which the adjustment procedure easier DISASSEMBLY NOTE BEFORE STARTING DISASSEMBLY Due to the diversity of models that the Twin Cam 88 engine is used in there may be additional steps needed to remove and or disassemble parts from the chassis and engine You should obtain the factory service manual for the specific model bike that the these heads are to be installed on and follow the instructions in the stripping motorcycle for service and top end overhaul headings in section 3 WARNING To avoid accidental start up of vehicle and possible personal injury disconnect the battery cables negative cable first before performing any of the
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