The Holley Double Pumper is a 650 CFM carburetor on a 4150 square-bore flange, built for hot street cars and dedicated race vehicles. It's best suited to lightweight vehicles running a manual transmission, or an automatic with a high-stall converter and low rear gearing. Dual accelerator pumps add extra fuel under initial throttle, mechanical secondaries deliver strong top-end performance, dual feed fuel inlets keep volume consistent at high demand, and a cable-operated manual choke handles cold starts. Every unit ships in a polished, shiny finish and is 100% wet-flow tested by Holley before it goes out the door.
Specifications:
- CFM: 650
- Barrels: 4
- Model: 4150
- Secondaries: Mechanical
- Booster Design: Straight
- Fuel Inlet: Dual
- Choke: Manual, cable-operated
- Finish: Shiny (polished)
- Material: Aluminum
- Primary Main Jet: 67
- Secondary Main Jet: 73
- Primary Power Valve: 6.5
- Throttle Bore: 1.688 in
- Vacuum Ports: 1 timed (spark), 1 full, 1 PCV
- Carburetor Use: Performance and Race
- Fuel Type: Gasoline
- Warranty: Manufacturer's Limited 90-Day Warranty
- Part Number: 0-4777S
Uses the square-bore 4150 flange bolt pattern (5-3/16" x 5-5/8"), making it a direct fit for many Holley, Edelbrock, Carter AFB, and Autolite carburetors sharing the same pattern. A spreadbore-to-square-bore adapter is required for spreadbore-style intake manifolds.
FAQ
What CFM and flange pattern does the 0-4777S use?
650 CFM on a square-bore 4150 flange, 5-3/16" x 5-5/8" bolt pattern.
What vehicles and transmissions is this carburetor best suited for?
Lightweight vehicles with a manual transmission, or automatics with a high-stall converter and low rear gearing.
Can this replace other carburetor brands?
Yes, it's a direct fit for other 4150-pattern carburetors including Holley, Edelbrock, Carter AFB, and Autolite units with the same 5-3/16" x 5-5/8" bolt pattern.
Does this carburetor need an adapter for a spreadbore intake?
Yes, a spreadbore-to-square-bore adapter is required if installing on a spreadbore-style intake manifold.
What finish does the 0-4777S come in?
A polished, shiny aluminum finish.
