INSTALLATION INSTRUCTIONS - Holley Performance Products
Contents
1. front attaching bolts and two 2 rear attaching nuts Lift free the linkage bracket if so equipped located at the right rear attaching nut and remove the carburetor by lifting straight up Remove all original manifold studs Insert the four 4 studs provided New studs should be threaded securely into the manifold 3 WARNING Use the proper gaskets Three 3 types of gasketing will be found on the vehicles for which this carburetor is designed GASKET A GASKET B ILLUSTRATION 2 INTAKE MANIFOLD WITH EXHAUST HEAT TRACK IN FRONT OF PRIMARY THROTTLE af ea 4 e er mea N rs GASKET 4 SHOWN IN Illustration 1 Illustration 2 NOTE See Illustration 9 A A steel reinforced gasket plus a thin stainless steel plate used to cover the exhaust heat track or slot in the front of the intake manifold can be found Carefully remove both the steel plate and the gasket Clean the manifold surface Install the new gasket supplied with the carburetor See Illustration 1 gasket B Reinstall the steel plate See Illustration 2 The thin gasket found in the carburetor should not be used A new stainless steel plate can be purchased under Holley P N 108 20 NOTE See Illustration 9 B If there is a large aluminum and fiber heat shield that extends well beyond the throttle body this must remain in place The gasket packed with the carburetor is placed on top of the heat shield See Illustration 1 gasket A C If there i2. 10 Remove the air cleaner stud from the original carburetor and install it on the new carburetor 11 On A I R air pump equipped vehicles connect the air pump control valve sense line to one of the manifold vacuum sources provided Connect the gulp valve hose to the rear of the vehicle if so equipped 12 Recheck all the vacuum hoses to assure they are attached properly Carburetor fittings that are not used are capped with the rubber plugs provided 13 Start the engine and check the fuel inlet fitting for fuel leaks 14 Preset the idle mixture as follows A Open the idle needles to full rich position counterclockwise DO NOT remove the idler limiter caps B Preset each needle as follows 1 327 350 engines 1 2 turn in from full rich 2 396 402 engines 1 4 turn in from full rich 15 Set the idle speed to the manufacturer s specification on the tag in the engine compartment or from the appropriate service manual If the above data is unavailable use the following guidelines NOTE Always set the idle speed with the parking brake on All Automatic Transmissions 600 R P M in drive All 396 427 Manual 800 R P M in neutral All Other Manuals 700 R P M in neutral NOTE Use only the carburetor speed screw to achieve this speed If idle quality is unacceptable at this setting the idle mixture may be adjusted a MAXIMUM OF 1 4 TURN FROM THE INITIAL SETTING It is preferable to use an exhaust gas C O carbon monoxide analyzer to achieve thes
3. will be issued for any misapplication once the carburetor has been installed Some parts provided with the carburetor might not be used on your installation Extra parts have been provided because the parts that are required for one model year might be different from those of another year INSTALLATION INSTRUCTIONS 1 Remove the air cleaner carefully disconnecting any vacuum lines Mark these lines so they can be reassembled to the cleaner in the same manner 2 Remove the existing carburetor by following the procedure outlined below A B C D mm Remove the steel fuel line fitting carefully Remove the throttle linkage and automatic transmission controls at the throttle lever Remove the throttle return spring noting how the spring is anchored Remove the PCV hose from the front of the carburetor Remove the spark advance hose s noting that the left upper front is a manifold vacuum attachment and the right lower front is a timed vacuum attachment if so equipped Remove the fresh air hose from the upper rear of the carburetor if so equipped noting it as the fresh air hose Remove the gulp valve hose only found on some California cars equipped with A I R emission control systems from the lower rear of the carburetor Detach the choke rod from the original carburetor Be sure to note how it pulls to close the choke plate or whether it pushes to close the choke plate See Illustration 7 Remove two 2
4. INSTALLATION INSTRUCTIONS FOR MODELS 4165 amp 4175 R 6210 3 amp R 8679 TO PRESERVE YOUR WARRANTY THESE INSTRUCTIONS MUST BE READ THROUGHLY AND COMPLETELY BEFORE AND DURING INSTALLATION The 6210 3 and 8679 carburetors have been designated and calibrated as direct bolt on replacement carburetors for 1965 1970 Chevrolet passenger vehicles only originally equipped with a Rochester Quadra Jet carburetor Specific recommendations and descriptions for each carburetor list number are shown in the accompanying chart on the last page of the instruction sheet NOTE Use of these carburetors on other G M or Chrysler applications with spreadbore intake manifolds and or Rochester Quadro Jet carburetors will probably result in poor engine performance This results from the fact that carburetors intended for use on other applications have different requirements in the area of fuel delivery rate gasket sealing characteristics ignition spark advance choke operation and power enrichment Holley Carburetor division cannot and will not be responsible for any actual or alleged engine or other damage or injury that results from misapplication voids warranty of any of the carburetors listed above If you are in doubt about proper carburetor applications consult the Holley catalog If for some reason you have purchased the wrong carburetor for your application return it to your dealer before installation and get the proper carburetor No warranty
5. d Starting Procedures For cold engines the following steps should be followed A Depress the accelerator pedal to the floor and allow it to return to normal position this charges the manifold with fuel and sets the choke B With the foot off the pedal crank the engine until it fires C Repeat steps A and B should the engine fail to run after the initial start As indicated in the manufacturer s operating instruction manual full power operation is not recommended until the engine reaches the correct operating temperature 2 Fast Idle Speeds The factory setting on fast idle speeds for these carburetors is adequate for the majority of vehicles Should the particular application require adjustment the following procedure should be used A With the engine running and in neutral advance the throttle and place the fast idle cam such that the fast idle speed screw contacts the top step of the cam On this step set 1600 RPM with the engine warm B If step A is correctly set the idle speed on the last or low step of the cam will be 1200 or 1300 RPM MAINTENANCE WARNING Fuel system components including fuel lines and the carburetor should be inspected periodically to assure no fuel leakage and the soundness of hoses Today s controlled 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 a 180 position
6. e settings Idle settings should not exceed 1 0 CO on 68 69 vehicles and 5 on 70 vehicles to assure compliance with Federal Emission Standards SPECIAL AIR CLEANERS Some air cleaners require slight rotation for installation and the cleaner locator should be modified accordingly Connect the vacuum hose t For high performance open element cleaners the clean air tube elbow must be removed from the lower tray and the resulting hole plugged with a plug provided Connect the rocker cover hose to the new adapter elbow as in Illustration 8 Adapters may be purchased as Holley P N 17 8 For Cowl induction cleaners replace the spacer from the original carburetor with Holley spacer P N 17 13 For special Cowl induction Camaros remove the upper portion of the cleaner ring and discard Install the cleaner spacer onto the carburetor and reinstall the cleaner Illustration 8 Illustration 9 NOTICE Holley Model 4165 spreadbore carburetors that have carbon deposits in the areas shown by the arrows will not be accepted for warranty The deposit is evidence of improper installation not using the stainless steel plate where required for which Holley cannot assume liability WARNING Inadequate clearance between the air cleaner and the throttle lever could result in uncontrolled engine speed CAUTION Check the clearance between the air cleaner and the hood before closing the hood completely OPERATING INSTRUCTIONS 1 Col
7. ing Operate the linkage to assure correct travel by opening to wide open throttle Operate the linkage from inside the vehicle and have someone check to assure complete opening of the throttle plates Readjust the throttle bracket cable if necessary Readjust the throttle operated transmission switch if necessary automatic transmission vehicles only Check the chassis service manual for proper adjustment procedures WARNING Check the assembled linkage to make sure that there is no binding or sticking during any part of throttle operation A binding throttle could result in uncontrolled engine speed 7 Reconnect the choke rod installing in the rear hole to pull close and in the front hole to push close Operate the choke link to assure free choke travel holding the throttle lever partially open See Illustration 7 SECONDARY TIMED SPARK ACCELERATOR PUMP ADVANCE Connect OPERATING LEVER distributor vacuum advance here FUEL INLET INSERT CHOKE FAST IDLE ROD HERE TO INSERT CHOKE ROD SPEED SCREW CLOSE PULL HERE TO CLOSE TYPE CHOKES PUSH TYPE CHOKES Illustration 7 8 Reconnect the appropriate hoses to the carburetor noting the correct fitting from Illustrations 4 amp 7 Plug any ports that are not used with the rubber plugs provided 9 Reconnect the fuel line to the front of the carburetor CAUTION In some cases it may be necessary to reform the line to align with the carburetor fitting DO NOT induce any sharp bends
8. s a standard type gasket with no extra metal gasket or heat shield replace this with the thin one supplied with the carburetor See Illustration 1 gasket A Compare Relative Location THROTTLE BALL POSITIONS i with Original Carb jy aani 7 usr ree TRANSMISSION KICKDOWN STUD LOCATIONS Small Blocks and Some Big Blocks 7 IDLE MIXTURE 9 SCREW IS REMOVE 2 SCREWS TO REMOVE LOWER PORTION amarrean OF THROTTLE LEVER ON SOME BIG BLOCKS SPRING MOUNT Illustration 3 4 To install the new Holley carburetor the following procedure is suggested prior to assembly on the manifold A Assemble to the Holley throttle lever in the appropriate locations this can be determined by comparison with the original carburetor any balls or lever extensions that were used on the original carburetor If a ball exists on the original carburetor lever that cannot be removed a corresponding ball can be found in the parts package See Illustration 3 B For 1966 and 1967 California Only vehicles the sealing plug in the rear gulp valve tube must be removed use screwdriver before the carburetor is placed on the manifold See Illustrations 4 amp 5 These carburetors have been produced using two different throttle body designs If your unit does not have the gulp valve tube cast integrally in the throttle body i e if it looks like Illustration 5 it will be necessary to remove the sealing plug wi
9. should be replaced The presence of liquid fuel demands tightening of the fittings hose replacement and retorquing of the fuel system component flange nuts where applicable Tightening of carburetor fuel bowl screws should provide 25 30 in Ibs of torque in a clockwise direction Periodically recheck the torque of the fuel bowl screws such as at regular maintenance intervals GENERAL Correct engine timing spark plug gaps and heat range distributor point condition and gap condenser and wiring valve lash condition of PCV valve and correct operation of the exhaust heat valve are very important to the optimum efficiency and performance For additional information consult the Holley Carburetor and Manifolds H P Books and the Holley Service Guide No 2 Holley Carburetor Features and Recommendations Divorced Hand Center Inlet Single Inlet Side Pivot Vacuum Emission Recommendation Choke Choke Dual Feed Fuel Floats No External Fuel Sec Compliance Level Adjustment Level Adjust 1965 1970 0 6210 X xX X 1965 1970 650 CFM 327 402 CID 0 8679 X xX X X 1965 1970 650 CFM 327 402 CID Due to casting requirements for the divorced choke carburetors equipped with divorced chokes cannot be converted to hand chokes Copyright 1992 Holley Printed in U S A Performance Products Inc 199R 8020 3
10. th a screwdriver Install a 1 8 close nipple and 1 8 pipe coupler to provide a mount for the gulp valve hose See Illustration 6 MANIFOLD VACUUM SOURCES For Air Cleaner and Air Pump If so equipped INTEGRALLY CAST GULP SECONDARY VALVE BOSS Se Sine Bis MACH LU T PLUG LOCATED i PIPE CLOSE INSIDE BOSS EXTERNALLY VISIBLE COUPLER NIPPLE Illustration 4 Illustration 5 Illustration 6 WARNING Do not overtighten the close nipple and or pipe coupler because it can crack the throttle body C On late model big block engines the lower portion of the primary throttle lever may have to be removed This is determined by placing the carburetor on the manifold and operating the throttle lever to the wide open position If the lower part interferes remove the two screws holding the lower lever on and remove the lower lever See Illustration 3 5 Place the carburetor on the manifold Reposition the throttle bracket if used NOTE On some applications the throttle cable mounting bracket must have a corner removed to allow it to be reassembled on the mounting stud Install nuts on the top threads only until all nuts have been started This allows the carburetor to be shifted to facilitate nut installation Cross tighten the mounting nuts alternately WARNING Overtightening may result in warped or cracked carburetor bodies Reconnect the throttle and transmission linkage and throttle return spr
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