TRUCK AVENGER™ CARBURETOR - Holley Performance Products
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1. TRUCK AVENGER CARBURETOR P N 0 90470 0 90670 amp 0 90770 INSTALLATION TUNING AND ADJUSTMENT MANUAL 199R10268 4 NOTE These instructions must be read and fully understood before beginning installation If this manual 15 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 TRO DU 3 4 INSTALLATION NOTES 5 c cessssececssseseceesesesseseseseescseseescseseacseseaceesueaceeseaeeeees 4 CHRYSLER APPLE 4 FORD APPLICATIONS 5 GM APPLICATIONS 2 6 WSTALLAT ON 6 CHOKE ADJUSTMENT cccecsssscecssscsecsssssesssesecssacsesessesesesaesesesacsesnsacsesneaeeeees 9 IDLE MIXTURE NEEDLES cscsssscecssescecesesececsesesessesesessesecesacsessaeeeesacseees 10 FLOAT LEVEL ADJUSTMENT s cscsssccecessececessesecessesesessesesesscsesrscsesraeeeees 11 VACUUM OPERATED SECONDARY 11 VACUUM OPERATED SECONDARY TUNING 12 SETTI2. WARNING On Ford C 4 and C 6 automatic transmission vehicles only install the transmission kickdown adjustment screw and black retaining clip as correctly indicated Failure to attend to this detail may result sticking wide open throttle or dangerous uncontrolled engine speed 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 install 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 high
3. 90470 JET JET NOZZLE VALVE VALVE SPRING 0 035 R 90670 0028 65 NA Black 68189 __ 65 R 90670 2 R9O770 74 9 0038 285 1 lack 13 HOLLEY TRUCK AVENGER LIMITED LIFETIME WARRANTY Holley Performance Products warrants its Holley Truck Avenger Carburetor to be free from defects in material and workmanship for the life of the product on parts and one year on repair labor After a period of one year Holley will charge standard rates for repair labor For any Holley Truck Avenger Carburetor used in any type racing or off road use will only be covered by a one 1 year limited warranty on parts and labor Warranty performance will be initiated by returning the alleged defective product to HOLLEY PERFORMANCE PRODUCTS with the original dated purchase receipt Purchaser is to call toll free the Holley Factory Service number at 1 866 GOHOLLEY to receive details and shipping instructions Holley Performance Products does not warrant products which have been a modified or altered outside factory specifications 0 subjected to conditions such as abuse misuse neglect accident improper installation or adjustment contaminants water or corrosion gum or varnish use of improper or poor quality fuel or fuel additives fire from a backfire and faulty repair or c in other than those automotive applications recommended in a current Holley catalog Holley shall not be responsible for a actual
4. 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 vm 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 We recommend that you only use Holley Weiand manifolds which you can find at your nearest dealer 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 you 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 67 Install the stud in the throttle lever extension Figure 1 See the appropriate service manual for transmission adjustment Throttle Stud P N 20 67 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 transmiss
5. 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 See the appropriate service manual for transmission adjustment INSTALLATION 1 Install the carburetor mounting studs not provided in 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 4 2 ENGINE Figure 5 WARNING Overtightening may result in a warped or cracked carburetor throttle body 4 Before connecting the linkage operate the throttle lever to ensure 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 WARNING Any sticking binding or other interference in the throttle link
6. NG MAIN JETS cccsssscecssescecesessecesecseceseesesessescsesaesesesatsesesrsesesateeseses 13 CARBURETOR SPECIFICATIONS s sscecsssssesessesecessesesssatsesusrseseserseseces 13 HOLLEY TRUCK AVENGER LIMITED LIFETIME WARRANTY 14 INTRODUCTION CONGRATULATIONS on your purchase of the Truck Avenger Carburetor We feel that you have purchased the finest off road performance carburetor manufactured today Should you need information or parts assistance please contact our Avenger Technical Service Department at 1 866 GOHOLLEY 1 866 464 6553 Please have the part number and sales receipt ready when calling The Truck Avenger Carburetor is a new evolution in off road carburetor technology Holley has answered the call for a new carburetor that can handle the rigors of off roading while maintaining fuel control under demanding situations Your new Truck Avenger Carburetor has the capability to control fuel slosh and booster bleed in the following situations gt Climbs up to 40 degrees gt Side hill maneuvers up to 30 degrees gt Steep descents up to 30 degrees Enjoy your new carburetor and feel free to attack that obstacle with confidence knowing that Holley has it under control IMPORTANT The TRUCK AVENGER carburetor has been factory wet flowed and calibrated The out of the box settings should be very close for all adjustments To preserve warranty these instructions must be read
7. a carburetor manifold change they result from manifold vacuum leaks similar to those described above Assuring a proper manifold installation rather than assuming the carburetor is not functioning properly will ultimately save time 10 FLOAT LEVEL ADJUSTMENT Primary and secondary float adjustments are set at the factory but variations in fuel pressure could cause a change in these settings To aid in adjustment of the float levels clear sight plugs are installed from the factory These do not need to be removed from the bowls to make this adjustment The following procedure shows how to make these adjustments 1 Start the vehicle 2 Observe the sight plug hole for the fuel level If none is seen the level is too low NOTE A properly set float level will have the fuel level located at the bottom edge of the sight plug as shown by the line in Figure 12 Float Level Lock Screw Float Level Adjusting Nut Fuel Level Figure 12 3 adjust shut down the engine 4 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 5 Using a 5 8 wrench turn the adjusting nut in the appropriate direction Clockwise to lower float and counterclockwise to raise float Turn the adjusting nut in increments of 1 4 of a rotation Retighten the lock screw 6 Restart the vehicle and observe the fuel level 7 Repeat steps 1 through 6 as necessa
8. ability when the vehicle is cold B Achoke that comes off too late could exhibit one or more of the following symptoms black smoke from the tail pipe poor driveability when cold poor gas mileage misses or rough idle 2 From the factory the choke cap has built in limiters If choke operation is unsatisfactory and you have adjusted the choke cap in either direction to the limiters with unsatisfactory results recheck your positive electrical line connection 3 Ifthe fast idle RPM is too low or too high for your preferences TURN THE ENGINE OFF Advance the throttle to wide open exposing the fast idle set screw below the choke housing See Figure 8 4 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 Fast idle speed screw 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 are the pro
9. age 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 ensure 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 Secondaries will not open mechanically during this procedure Vent Vacuum Tube Choke Secondary Plate List Number amp Production Date Lock crew Lock Screw Fuel Level Adjusting Nut Fuel Level Secondary Nut Fuel Bowl Primary Fuel Bowl Fuel Level Sight Plug Fuel Level Sight Plug PCV Timed Spark ged Vacuum i 9999 Diaphragm Negative Positive Housing Choke Choke Screw One Lead lead each side Figure 6 6 Reconnect the appropriate vacuum hoses to the carburetor noting the correct fitting from Figure 6 and 7 Replace any
10. and followed thoroughly before and during installation NOTE The Truck Avenger Carburetor kit has not yet been submitted for emissions testing and therefore has not received an Executive Order Exemption from the California Resources Board This means that your vehicle will NOT be Smog Legal in all 50 states with this kit installed These carburetors have been designed and calibrated as a universal carburetor for light truck applications It is designed for use on square flange intake manifolds Carburetor adapters are not recommended to adapt to spread bore intake manifolds since adapters may have an adverse affect on cylinder to cylinder distribution and ultimately total engine performance However some manifolds may be universal such as Weiand 8004 Please check with Holley s Avenger Technical Service Department if you have any questions REMOVAL 1 Remove the air cleaner exercising care to carefully detach any vacuum lines from the air cleaner and marking them 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 foreign 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
11. aries is properly calibrated there should not be a kick only a smooth increase in power should be felt VACUUM OPERATED SECONDARY TUNING The secondaries will not open by free revving the engine The engine needs to be under a load before they will open If you are still uncertain if they are opening you can take a normal paperclip and clip it onto the secondary diaphragm rod and slide it up against the bottom of the secondary diaphragm housing Go out and drive the vehicle making sure to get into the secondaries When you return you will be able to look at the position of the paperclip on the rod If it is lower on the rod you can tell the secondaries opened and how far they opened This is useful in determining if you need a heavier or lighter secondary spring 1 Remove the air cleaner assembly 2 Remove the 2 Phillips screws from the black vacuum diaphragm spring cap Figure 15 3 Lift off the cap and spring Remove the spring from the cap Replace with a softer silver spring if desired 4 The silver spring will allow the secondaries to open sooner for light trucks and increase performance 5 The black spring installed at the factory will force the secondaries to open later for heavier trucks and increase fuel economy Figure 13 Figure 14 6 black spring that comes in the Truck Avenger Carburetor kit has been calibrated to give the best performance and fuel economy in most applications 7 Once you have s
12. cracked or dry rotted hoses at this time to prevent any vacuum leaks A 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 available at most automotive stores 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 7 Connect the PCV hose to the PCV fitting in the carburetor 8 Connect the power brake hose if applicable to the fitting as shown in Figures 6 or 7 Full Manifold Vacuum Port 3 S Vacuum Port 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 NOTE If installation requires cutting the metal fuel line cut the fuel line with a good tube cutter This will minimize the chance of producing metal chip particles If a hacksaw must be used then metal chips must be removed WARNING all cases where the fuel line has been cut it is essent
13. elected a spring attach it to the cap Figure 13 by placing the small end of the spring over the center post on the cap Check the o ring seal and place the cap and spring back into the vacuum diaphragm housing Figure 14 Figure 15 12 8 Tighten the two Phillips screws securely and reinstall the air cleaner as shown in Figure 15 9 Test drive the vehicle JETTING MAIN JETS Due to varied applications that a universal performance carburetor 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 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 In 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 CARBURETOR SPECIFICATIONS CARBURETOR PRIMARY SECONDARY PUMP PRIMARY SECONDARY SECONDARY METERING METERING DISCHARGE POWER POWER DIAPHRAGM R
14. er 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 CHOKE ADJUSTMENT IMPORTANT The TRUCK AVENGER 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 You can control the choke operation by rotating the choke cap If the choke comes off too soon loosen the three screws and rotate the choke cap counterclockwise one notch at a time until the choke operation is satisfactory Rotate the choke cap clockwise if the choke comes off too late After making the final adjustments start the engine and make sure the choke plate opens completely A Achoke that comes off too soon could exhibit one or more of the following symptoms stalling surging backfiring stumbles or poor vehicle drive
15. ial that it be clean to ensure 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 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 ensure maximum protection Now would be the perfect time to upgrade to a Holley Powershot air filter 9 For choke hookup attach the bayonet end of the long electrical lead supplied to the positive terminal on the choke The other end must be connected to an ignition activated 12 volt source The distributor side of the ignition coil is NOT a 12 volt source It is a 7 9 volt source after cranking WARNING Connecting the choke cap to the ignition or ignition coil could result in unacceptable choke operation
16. ion damage may result from improper application use NOTE Unless replacing an existing Holley Carburetor you will need to purchase Holley P N 20 91 spring and perch kit for Ford automatic transmissions 1 Install the new throttle ball lockwasher 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 See the appropriate service manual and page 8 of these instructions for proper transmission adjustment Transmission Kickdown Lever Spring Perch Transmission Kickdown Adjusting Screw Throttle Stop Lever Transmission Kickdown Adjusting Transmission Kickdown Spring Screw Retainer Black Clip 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 THROTTLE TANG INSIDE VACANT TUNNEL KNUCKLES TUNNEL KNUCKLES INCORRECT Screw amp Clip will move Lockout CORRECT Screw Screw amp Clip firm and secure Figure 3 Ford applications Figure 4 Ford applications GM 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
17. l a kick when the secondaries engage Still others believe that they should disconnect the vacuum diaphragm and make the secondaries open mechanically Before going any further let s discuss these points a reverse order First if we could make our vacuum operated secondary carburetors perform better by opening the secondaries mechanically it would be to our advantage to do so since all that vacuum actuating hardware is expensive and requires much time and money to calibrate Mechanical secondary carburetors all utilize a secondary pump shot to prevent bogging when the secondaries are opened Secondly those who feel a kick when the secondaries engage are actually feeling a flat spot during initial acceleration because the secondaries have already begun to 11 open and have weakened the fuel delivery signal to the primary boosters The engine is struggling to increase speed and what they actually feel are the secondary nozzles crashing in as the engine finally reaches the speed where it provides the proper fuel delivery signal to primary and secondary venturi Third opening the secondaries early causes the situation described above The secondaries must not open until the engine requires the additional air This allows torque to increase along the peak torque curve Performance is compromised less by holding the secondaries closed a little longer than by opening them a little too soon If the opening rate of the vacuum operated second
18. or alleged installation or removal labor inbound shipment costs or other incidental charges b actual or alleged incidental or consequential damages incurred by the use of a Holley Truck Avenger Carburetor Further there are no warranties which extend beyond those stated here This warranty is extended to the original consumer purchaser and has as duration the lifetime from date of original purchase by such consumer THIS WARRANTY IS EXPRESSLY IN LIEU OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE AND ALL OTHER OBLIGATIONS OR LIABILITIES ON OUR PART WE NEITHER ASSUME NOR AUTHORIZE ANY OTHER PERSON TO ASSUME FOR US ANY OTHER LIABILITY INCONNECTION WITH THE SALE OF THIS TRUCK AVENGER CARBURETOR WE MAKE NO WARRANTY WHATSOEVER IN RESPECT TO ACCESSORIES OR PARTS NOT SUPPLIED BY US AS USED IN THIS WARRANTY PURCHASER SHALL BE DEEMED TO MEAN ONLY THAT PERSON FOR WHOM THE TRUCK AVENGER CARBURETOR WAS ORIGINALLY PURCHASED Final warranty determination will be the decision of Holley Performance Products Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty lasts so the above limitations or exclusions may not apply to you This warranty gives you specific legal rights and you may also have other rights that vary from state to state This wa
19. per steps for setting the idle mixture needles 1 Attach the vacuum gauge to a manifold vacuum port on the throttle body Figure 7 2 Adjust each idle mixture screw Figures 9 amp 10 1 8 turn at a time alternating between each screw Turn them equally until you achieve the highest possible vacuum reading or smoothest idle without adjusting the curb idle soeed screw Turn screws in to lean the mixture Turn them out to richen the mixture Idle Mixture Figure 9 Figure 10 Now that the idle mixture is set it may be necessary to go back and reset the idle speed using curb idle speed screw as shown in Figure 11 4 lfavacuum gauge is not available use a tachometer to obtain the highest RPM Curb idle speed screw 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 If 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
20. poor fuel economy and possible engine misfiring since the voltage delivered to the spark plugs will be severely reduced by the drain imposed by the choke cap Suitable ignition activated 12 volt sources are most electrical relays as well as the leads to accessories such as windshield wipers DO NOT connect this wire to the original equipment O E electric choke source This may not be a 12V source 10 Check the voltage source with a volt ohm meter to assure proper voltage and choke operation 11 Start the engine and check the fuel line 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
21. rranty shall apply only within the boundaries of the continental United States Holley Performance Products Inc 1801 Russellville Road Bowling Green KY 42101 3542 Technical Service 1 866 GOHOLLEY 1 866 464 6553 199R10268 4 Revision Date 1 30 12 14
22. ry WARNING Removal of the spring loaded needle and seat assembly may cause some components to fall into the float bowl Therefore if the removal of the spring loaded needle and seat assembly is ever attempted Holley recommends removing the float bowl first SECONDARY FLOAT LEVELS Very little fuel is drawn out of the secondary fuel bowls during idle operation This makes it a little tricky to set the proper float level with the sight plugs installed Many customers attempt to adjust the rear float level down by turning the adjusting nut clockwise only to see the fuel level rise through the sight plug This is due to the float being pushed down into the fuel therefore displacing the fuel to a higher level You will find it easier to adjust the float levels if you rev the engine slightly by opening the secondaries between adjustments This can be easily done by pushing upward on the secondary diaphragm stem or by rolling the secondary throttle shaft linkage forward on the driver s side of the vehicle This will use fuel from the secondary bowl at a much faster rate allowing the float level to seek the adjustment point that you have set Once the floats have been set with this procedure drive the vehicle making sure the secondaries open and recheck the float level VACUUM OPERATED SECONDARY THROTTLES Many people have the misconception that opening the secondary throttles sooner will provide increased performance Others think they must fee
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