1978-1987 Grand Prix Holley 650 CFM Double Pumper Carburetor, Manual Choke, Gold Finish 0-4777C

Holley Double Pumper carburetors are a perfect performance upgrade for hot street cars and race vehicles. Double Pumper carburetors are an American icon when it comes to performance carburetors. From their roots as the premier carburetor on many factory muscle cars to powering thousands of vehicles across the finish line, the Double Pumper is a great choice whether your Grand Prix is burning up the street or the quarter mile. The Double Pumper is designed for use on lightweight vehicles with a manual transmission or an automatic transmission with a high stall and low rear end gears. The Double Pumper is available in a gold dichromate or tumble polished shiny finish and features dual accelerator pumps for additional fuel under initial acceleration; mechanical secondaries for great performance; dual feed fuel inlets for constant high volume fuel delivery and a manual choke for easy control of engine warm up. Don't trust your performance to just anyone, Holley is the only modular carburetor company that has been in business for over 100 years and has powered every NASCAR champion since the 60's.

Features:

• Gold Dichromate finish for corrosion resistance and classic Holley looks
• Optimized street/strip calibration that works out-of-the-box
• Manual choke (Cable driven, hand operated) for precise cold start control
• Mechanical secondaries for awesome tire turning performance
• Dual accelerator pumps for additional fuel under initial acceleration
• Dual feed fuel inlets for constant high volume fuel delivery
• Intended for lightweight vehicles w/ manual trans or automatics with high stall & low gearing
• 100% wet-flow tested by Holley technicians to assure it arrives ready to run!

Specs:

• Barrels:4
• Booster:Straight
• Carburetor Use:Performance and Race
• CFM:650
• Choke:Manual
• Finish:Gold Dichromate
• Fuel:Gasoline
• Fuel Inlet:Dual
• Material:Aluminum
• Primary Main Jet:67
• Primary Power Valve:6.5
• Primary Pump Nozzle Size:28
• Secondaries:Mechanical
• Secondary Main Jet:73
• Secondary Pump Nozzle Size:28
• Throttle:1.688 inch
• Vacuum Ports:1 timed (spark) port, 1 full, and 1 PCV port
• Warranty:Limited 90 Day

Manufacturer Part Number : 0-4777C

Part Notes:

This model of carburetor has the square bore flange bolt pattern. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with 5 3/16in x 5 5/8 bolt pattern. If you have a spreadbore style intake manifold, you will need an adapter to install this carburetor.