ULTRA DOUBLE PUMPER™ CARBURETOR 0-76650RD 0-76650BL 0-76650BK 0-76650HB 0-76750RD 0-76750BL 0-76750BK 0-76750HB 650 CFM Shiny Ultra Double Pumper™ with Red™ Billet Parts & Electric Choke 650 CFM Shiny Ultra Double Pumper™ with Blue™ Billet Parts & Electric Choke 650 CFM Shiny Ultra Double Pumper™ with Black™ Billet Parts & Electric Choke 650 CFM Hardcore Gray™ Ultra Double Pumper™ w/ Black™ Billet Parts & Elec.
TABLE OF CONTENTS: INTRODUCTION: .........................................................................................................................3 REMOVAL: ..................................................................................................................................3 INSTALLATION NOTES: .............................................................................................................3 CHRYSLER APPLICATIONS: .............................................................
INTRODUCTION: CONGRATULATIONS on your purchase of the Ultra Double Pumper™ Carburetor! We feel that you have purchased the finest street performance carburetor manufactured today. Should you need information or parts assistance, please contact our Technical Service Department at 1-866-GOHOLLEY (1-866-464-6553). Please have the part number and sales receipt ready when calling. IMPORTANT: The Ultra Double Pumper™ carburetor has been factory wet-flowed and calibrated.
Figure 1—Chrysler applications FORD APPLICATIONS: 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).
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 (Holley® P/N 20-95) and stud and kickdown throttle bracket (Holley® P/N 20-121). Otherwise, SEVERE transmission damage WILL result. This carburetor is not designed to work with ANY other automatic overdrive transmissions. 1.
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. Figure 6 6. Reconnect the appropriate vacuum hoses to the carburetor, noting the correct fitting from Figure 6 and 8. A. B.
11. For electric choke hookup, attach the bayonet end of the long electrical lead supplied to the positive terminal on the choke cap. 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.
Hoses that exhibit surface cracks, when bent to 180°, should be replaced. The presence of liquid fuel demands tightening of fittings, hose replacement, and re-torquing of the fuel system component flange nuts. Periodically check the torque on the fuel bowl screws to 25-30 in./lbs. to ensure proper fuel metering.
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 and secondary metering blocks.
FLOAT LEVEL ADJUSTMENT: NOTE: Do not try to remove the sight glasses. It takes special tools to install these and it is not recommended that they be removed. 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 glasses are installed from the factory. The following procedure shows how to make these adjustments: 1. Start the vehicle. 2.
ACCELERATOR PUMP TUNING: The accelerator pump’s purpose is to make up for the lag in fuel delivery to enable the engine speed to increase in response to throttle opening. Differences in vehicle weight, transmissions, and rear axle ratios affect the amount of fuel and the delivery rate that should be provided by the accelerator pump. This may necessitate the customizing of your accelerator pump to your vehicle and its use.
4. At this point, there should be no bogs, flat spots or black smoke (indicating excessive richness) when accelerating at wide open throttle from a standing start. 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.
