Installation Instructions for Holley 0-4412S
Contents
1. PERF oF CARBURETOR P N 0 7448 0 4412C amp 0 4412S INSTALLATION TUNING AND ADJUSTMENT MANUAL 199R 7950 7 NOTE These instructions must be read and fully understood before beginning installation If this manual is not fully understood installation should not be attempted Failure to follow these instructions including the pictures may result in subsequent system failure TABLE OF CONTENTS INTRODUCTION eae etcetera ence ee item pre a nm sec ieee alent ep ee ew este 3 REMOVAL base we ca 3 INSTALLATION NO TE Sipin E 3 CHRYSLER APPLICATIONS ooie e ee caer 3 PORD APPLICATIONS 4 GMAPPLICA TIONS 5 INSTALLATION iaaea Aaea 5 CHOKE ADJUSTMENT cree ea E EEE aa aaa 8 IDLE MIXTURE NEEDLE S prce E 9 FLOAT LEVEL CHECK AND ADJUSTMENT 10 JE TTING MAINJET 5 ea a aaa aa aoa 11 POWER VALVES rni aA 11 CARBURETOR SPECIFICATIONS onini nena 11 INTRODUCTION CONGRATULATIONS on your purchase of a Holley carburetor We feel that you have purchased the finest performance carburetor manufactured today Should you need information or parts assi2. Ford applications WARNING If you are using this carburetor with a GM overdrive transmission TH700R4 or a TH200R4 you must use a transmission kickdown cable bracket Holley P N 20 95 and stud Holley P N 20 40 Otherwise SEVERE transmission damage WILL result This carburetor is not designed to work with ANY other automatic overdrive transmission 1 Remove the throttle cable ball and automatic transmission kickdown stud if any from the original carburetor and mount these in similar locations on the Holley throttle lever If the original throttle cable is too large a new throttle ball or stud is needed Holley P N 20 2 or 20 38 INSTALLATION 1 Install the carburetor mounting studs not provided the proper location on the intake manifold carburetor flange 2 Place the new carburetor flange gasket provided with the carburetor in the proper position on the intake manifold 3 Place the carburetor on top of the flange gasket on the manifold Install the hold down nuts and snug down progressively in a crisscross pattern 60 80 6 as shown in Figure 5 Figure 5 Carburetor torque sequence WARNING Overtightening may result in a warped or cracked carburetor throttle body 4 Before connecting the linkage operate the throttle lever to assure the correct travel no sticking or binding by opening to wide open throttle and back to closed throttle several times Correct any sticking or binding conditions
3. the engine and check the fuel lines and inlet fitting for possible leaks NOTE The recommended fuel pressure is 5 7 psi 12 Recheck to assure all existing vacuum hoses are attached properly Plug any fittings not used 13 With the engine at operating temperature set the idle speed to the manufacturer s specifications see page 9 for idle adjustment 14 Shut off the engine and readjust the throttle operated transmission linkage if necessary On installations that have a kickdown actuating switch on the passenger s side of the firewall it might be necessary to readjust it according to the manufacturer s service manual FORD APPLICATIONS WITH AUTOMATIC TRANSMISSIONS With the engine off push the transmission kickdown rod rearward until it stops and hold it in position Push the throttle lever rearward to its wide open throttle position and adjust the transmission kickdown screw to come in contact with the transmission kickdown lever tang WARNING With the engine off recheck the assembled linkage for sticking and or proper return to the idle position 15 Place the air cleaner gasket Supplied on the sealing flange and install the air cleaner 16 With some air cleaner configurations it may be necessary to use an air cleaner spacer to provide adequate clearance between the carburetor and the air cleaner Holley offers such a spacer Holley P N 17 13 Depending on the overall height obtain the proper length 1 4 x 20 stud and insta
4. al chip particles If a hacksaw must be used then metal chips must be removed WARNING In all cases where the fuel line has been cut it is essential that it be clean to insure that no metal particles enter the fuel bowl after the new carburetor installation Remove the fuel line at the pump and blow the line clean with compressed air DO NOT use the procedure where the coil wire is disconnected the engine cranked for a few revolutions and the fuel collected in a container This procedure is unsafe because sparking can occur either at the coil or at the distributor end of the coil wire and ignite any fuel spilled in the engine compartment CAUTION The use of a quality in line fuel filter such as Holley P N 162 523 is mandatory as a safeguard against possible flooding which could result from unfiltered particles becoming lodged between the fuel inlet needle and its seat This can result in fire if a spark is present or backfire occurs in the engine compartment Air cleaner filter elements should be blown clean with compressed air at 6 000 miles and replaced at 12 000 miles to assure maximum protection Now would be the perfect time to upgrade to a Holley Powershot air filter Holley P N 120 146 9 Connect the choke control cable Holley P N 45 228 to the choke actuation lever and mount the outer sleeve to the cable clamp 10 Actuate the choke cable through its full range of motion to ensure full choke operation Adjust as necessary 11 Start
5. before proceeding WARNING Any sticking binding or other interference in the throttle linkage could result in uncontrolled engine speed This could result in engine damage or personal injury 5 Reconnect the throttle and transmission kickdown linkage and throttle return spring Holley P N 20 89 Operate the carburetor throttle lever by hand to assure the correct travel no sticking or binding by opening to wide open throttle and back to closed throttle several times Correct any sticking or binding conditions before proceeding NOTE With the engine turned off have an assistant slowly press the accelerator pedal to the floor while you watch the throttle for any sticking or binding Correct any sticking or binding conditions before proceeding Also ensure that you are reaching full throttle Many performance problems are traced to partial throttle openings from improperly adjusted linkage CHOKE PLATE FUEL BOWL VENT CHOKE ACTUATION LEVER TIMED SPARK VACUUMPORT 0 7448 only TA FUEL LEVEL ADJUSTING NUT FUEL LEVEL SIGHT PLUG ee POWER BRAKE FUEL INLET OR PCV 9 VACUUM PORT FAST IDLE ADJUSTMENT Pa 5 FUEL BOWL SCREW IDLE MIXTURE SCREW ONE TIMED SPARK EACH SIDE VACUUM PORT 0 4412C amp 0 44125 only Figure 6 6 Reconnect the appropriate vacuum hoses to the carburetor noting the correct fitting from Figure 6 and 7 Replace any cracked or d
6. cuum port 2 Adjust each idle mixture screw Figures 10 amp 11 1 8 turn at a time alternating between each screw Turn them equally until you achieve the highest possible vacuum reading without adjusting the curb idle speed screw Turn screws in to lean the mixture Turn them out to richen the mixture Curb idle speed screw Figure 9 3 Now that the idle mixture is set it may be necessary to go back and reset the idle speed using the curb idle speed screw as shown in Figure 9 4 Ifa vacuum gauge is not available use a tachometer to obtain the highest RPM IDLE MIXTURE IDLE MIXTURE SCREW SCREW Figure 10 Figure 11 ROUGH IDLE AND VACUUM LEAKS If a rough idle persists after the engine has been started and the mixture screws adjusted check for manifold vacuum leaks These could result from unplugged vacuum fittings or a carburetor flange gasket that was torn during installation Recheck for proper attachment of all vacuum lines and check the lines for cracks lf the manifold was changed a manifold vacuum leak could occur at the cylinder head manifold surface due to damaged gaskets or improper torquing Frequently manifold vacuum leaks occur from the valley side of the manifold These are very difficult to detect unless a discernible whistle can be heard NOTE In most cases when rough idle occurs after a carburetor manifold change they result from manifold vacuum leaks similar to those described above Assuring a proper
7. ever Figure 1 Throttle Stud P N 20 36 Throttle Lever Extension P N 20 7 Figure 1 Chrysler applications FORD APPLICATIONS WARNING This carburetor is not designed for use with any Ford automatic overdrive transmission SEVERE transmission damage may result from improper application use 1 Install the new throttle ball lock washer and retaining nut to the carburetor throttle lever in the same position as the existing carburetor 2 Insert the transmission kickdown screw with the black retaining clip on the transmission kickdown lever Figure 2 This assembly must be installed according to the detailed drawing Figure 3 d 4 gt Gi my R EAN gt A Transmission s Kickdown Lever Spring Perch Transmission Kickdown Adjusting Screw Throttle Stop Lever Retainer Black Clip Transmission Transmission Kickdown Kickdown Spring Adjusting Screw Figure 2 Ford applications 3 Remove the lock out screw from the kickdown lever Figure 4 4 Install the transmission kickdown spring between the transmission kickdown lever and spring perch Figure 2 4 THROTTLE TANGINSIDE VACANT TUNNEL KNUCKLES TUNNEL KNUCKLES FINGERS NOT CONTACTING LEVER INCORRECT Screw amp Clip will move CORRECT Screw amp Clip firm and secure Figure 3 Ford applications GM APPLICATIONS Lockout Screw Figure 4
8. ll in the carburetor airhorn Close the hood slowly to ensure adequate clearance between the air cleaner stud and the hood WARNING Inadequate clearance between the air cleaner and the throttle lever could result in throttle sticking and uncontrolled engine speed Check the clearance between the throttle lever and air cleaner for proper operation Check the clearance between the air cleaner and the hood before closing the hood completely MAINTENANCE WARNING Fuel system components including fuel lines and the carburetor should be inspected periodically to assure no fuel leakage and to ensure the soundness of the hoses Today s clean emissions engines provide higher temperatures in the engine compartment These high temperatures promote faster aging of non metallic materials Hoses that exhibit surface cracks when bent to 180 should be replaced The presence of liquid fuel demands tightening of fittings hose replacement and retorquing of the fuel system component flange nuts Periodically check the torque on the fuel bowl screws to 25 30 in lbs to assure proper fuel metering GENERAL Some very important factors to optimize efficiency and performance include Correct engine timing correct spark plug gap and heat range ignition components in good working order and correct operation of exhaust heat valve WARNING On automatic transmission vehicles only install the transmission kickdown adjustment screw and black retaining clip as c
9. manifold installation rather than assuming the carburetor is not functioning properly will ultimately save time FLOAT LEVEL CHECK AND ADJUSTMENT Float adjustments are set at the factory but variations in fuel pressure could cause a change in these settings The following procedure shows how to make these adjustments 1 Start the vehicle 2 Remove the fuel bowl sight plug 3 Observe the sight plug hole for the fuel level If none is seen the level is too low Fuel should be even with the bottom of the sight plug hole If fuel comes pouring out of the sight hole the float is set too high NOTE A properly set float level will have the fuel level located at the bottom edge of the sight hole as shown by the line Figure 12 FLOAT LEVEL SIGHT PLUG LOCK SCREW FLOAT LEVEL ADJUSTING NUT PROPER FUEL LEVEL Figure 12 4 To adjust shut down the engine 5 Loosen the lock screw on top of the fuel bowl just enough to allow you to turn the adjusting nut Hold the screw in position with the screwdriver 6 Using a 5 8 wrench turn the adjusting nut in the appropriate direction Clockwise to lower float and counterclockwise to raise float 7 Turn the adjusting nut in increments of 1 4 of a rotation 8 Retighten the lock screw 9 Restart the vehicle and observe the sight plug hole 10 Repeat steps 1 through 8 as necessary 10 JETTING MAIN JETS Due to varied applications that a universal performance carbu
10. oreign particles can enter Wrap the end of the fuel line with a clean lint free cloth Disconnect and mark all vacuum lines and wiring if any to the carburetor Disconnect the PCV hose Disconnect the choke rod or heat tubes if equipped Disconnect and remove the throttle linkage and automatic kickdown linkage Save all retaining clips Unbolt and remove the carburetor from the manifold Use care not to let anything i e old gasket material fall into the intake manifold Lay a clean cloth across the intake manifold opening to guard against any foreign matter entering the intake manifold Cy 3 Ifthe intake manifold is being changed at this time install the new manifold according to the manifold s manufacturer s directions Since we are not familiar with all manifold instructions Holley cannot accept responsibility for their validity INSTALLATION NOTES CHRYSLER APPLICATIONS WARNING This carburetor is not designed for use with any Chrysler automatic overdrive transmission SEVERE transmission damage may result from improper application use 1 Unless you are replacing an existing Holley carburetor which already has a lever extension arm may need to purchase and install a throttle lever extension Holley P N 20 7 on the carburetor Remove the throttle stud and nut from the original carburetor You can purchase a new stud from your Holley dealer Holley P N 20 36 Install the stud in the throttle extension l
11. orrectly indicated Failure to attend to this detail may result in a sticking wide open throttle or dangerous uncontrolled engine speed CHOKE ADJUSTMENT IMPORTANT Your Holley carburetor has been factory wet flowed and calibrated The out of the box settings should be very close for all adjustments The following tuning section is included ONLY to aid you in fine tuning adjustments 1 If the fast idle RPM is too low or too high for your preferences SHUT DOWN THE ENGINE Advance the throttle to wide open exposing the fast idle set screw below the choke housing See Figure 8 2 Using a 1 4 open end wrench turn the screw clockwise to increase the RPM or counterclockwise to decrease the RPM The factory setting should give you a 1500 1600 RPM fast idle speed NOTE All vacuum ports must be plugged at this time Figure 8 IDLE MIXTURE NEEDLES Idle mixture needles control the air fuel mixture at idle These have been preset at the factory and SHOULD NOT need any adjustments However if you feel that adjustment is necessary you can use the following procedure to do so When tuning the idle mixture you re actually tuning for the best manifold vacuum Idle mixture needles are found on the primary metering blocks If you change one idle mixture needle you must change the other idle mixture needle by the same amount Here the proper steps for setting the idle mixture needles 1 Attach the vacuum gauge to a manifold va
12. retor will work with a few tips on jetting are provided to help you understand their purpose 1 Out of the box jetting is extremely close for most applications 2 Carburetors are calibrated at 70 at sea level Decrease the jet size primary and secondary one number for every 2000 ft increase in altitude 3 Holley jets are broached flowed and stamped according to flow rate NEVER drill jets as this seriously alters flow characteristics Stamped numbers are reference numbers and DO NOT indicate drill size 4 most cases it will be unnecessary to increase jet size more than four numbers greater than out of the box jetting Exceptions could arise when the carburetor is mounted on a very large volume plenum ram manifold 5 Spark plugs provide the best indication of proper jetting Consult an ignition manual for proper reading of spark plugs POWER VALVES The number stamped on a power valve such as 65 indicates the manifold vacuum below which the power valve is operational In this case all manifold vacuums below 6 5 Hg the power valve is operating Generally a 65 power valve is sufficient for most high performance applications that have a manifold vacuum of 12 Hg or higher However some problems can result with radically cammed machines equipped with automatic transmissions These vehicles often idle at 2000 rom approx 6 0 Hg At this point the main nozzles are starting to feed and richen the mixture supplied b
13. ry rotted hoses at this time to prevent any vacuum leaks A The full manifold vacuum source in the front of the throttle body provides vacuum for proper operation of the air cleaner the pump diverter valve if equipped AC Cruise and or the temperature sensing valve If vacuum for more than one component is needed use small plastic vacuum T s available at most automotive stores B The timed spark fitting in the choke side of the primary metering block provides vacuum for the operation of the distributor vacuum advance Connect the hose to the distributor spark delay valve and or temperature sensing valve as originally connected Again use T s as necessary If any questions arise about the hose connections consult the proper service manual C Plug any vacuum source not used 7 Connect the PCV hose to the PCV fitting in the carburetor 8 Connect the power brake hose to the fitting as shown in Figures 6 or 8 TIMED SPARK VACUUM PORT FULL MANIFOLD VACUUM PORT FULL MANIFOLD VACUUM PORT POWER BRAKE PC Figure 7 WARNING During the fuel line installation DO NOT allow any foreign particles to enter the fuel lines which could then cause flooding and may result in a fire WARNING Keep the fuel line away from the EGR valve if equipped on the intake manifold If installation requires cutting the metal fuel line cut the fuel line with good tube cutter This will minimize the chance of producing met
14. stance please contact our Technical Service Department at 1 270 781 9741 Monday through Friday 7 a m to 5 p m CST Please have the part number of the product you purchased on hand when you call NOTE The 0 7448 0 4412C and 0 4412S are designed as a universal type 2 barrel carburetors These model 2300 carburetors bolt directly to most Ford 2 barrel V 8 manifolds To preserve the warranty these instructions must be read and followed thoroughly before and during installation NOTE These carburetors are not designed to meet any emission requirements for 1968 and later applications Therefore they should be used only for competition off road vehicles or vehicles not required to comply with late model exhaust emission standards WARNING If you are using this carburetor with a GM overdrive transmission TH700R4 or a TH200R4 you must use a transmission kickdown cable bracket Holley P N 20 95 and stud Holley P N 20 40 Otherwise SEVERE transmission damage WILL result This carburetor is not designed to work with ANY other automatic overdrive transmission REMOVAL 1 Remove the air cleaner exercising care to detach any vacuum lines from the air cleaner without damage Note the original locations so they can be reassembled to the air cleaner in the same manner 2 Remove the existing carburetor by the following procedure A Carefully disconnect the fuel line WARNING Carefully protect the open end of the fuel lines so that no f
15. y the power valve and the engine will probably load up To correct this problem install a 45 or 35 power valve If the engine has a manifold vacuum of 12 Hg or less a good way to determine power valve size is take the manifold vacuum at idle and divide that number by two The answer is the power valve size This will provide idling and proper fuel flow under wide open throttle conditions when manifold vacuums seldom rise above 1 Hg CARBURETOR SPECIFICATIONS CARBURETOR PRIMARY PUMP METERING DISCHARGE POWER JET NOZZLE VALVE 0 7448 0 031 0 4412C 0 028 0 44125 0 028 11 Printed in U S A Copyright 2001 Date 8 3 01 12 Holley Performance Products Inc 1801 Russellville Rd P O Box 10360 Bowling Green KY 42102 7360 Technical Service 1 270 781 9741 Fax 1 270 781 9772 Email carbs support holley com Website www holley com Holley Performance Products 199R 7950 7
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