If you're looking to amp up your hot street car or race vehicle, the Holley MDL 4150 Double Pump Carburetor is just what you need. These carburetors are a true American classic, having powered countless factory muscle cars and racing champions. Whether you're tearing up the streets or hitting the quarter mile, the Double Pumper is a fantastic choice that won't let you down.

This carburetor is specifically designed for lightweight vehicles, whether you have a manual transmission or an automatic with a high stall and low rear end gears. You can choose between a stunning gold dichromate finish or a shiny tumble-polished look. With dual accelerator pumps, you’ll get that extra fuel right when you need it for a quick start. Plus, the mechanical secondaries ensure you get optimal performance every time. The dual feed fuel inlets guarantee a steady high-volume fuel supply, and the manual choke offers easy control for warming up your engine.

When it comes to performance, trust only the best. Holley has been a leading name in modular carburetors for over a century and has powered every NASCAR champion since the 1960s.

• Instructions for Part# 0-4781C
• Carburetor Numerical Listing for Part #0-4781C

• Gold Dichromate finish for corrosion resistance and that classic Holley appeal
• Optimized street/strip calibration that’s ready to go right out of the box
• Manual choke (cable-driven, hand-operated) for precise cold start control
• Mechanical secondaries deliver impressive tire-spinning performance
• Four corner idle lets you finely tune your idle system
• Dual accelerator pumps provide extra fuel for that initial burst of speed
• Dual feed fuel inlets ensure a constant high volume of fuel delivery
• Designed for lightweight vehicles with manual transmissions or automatics with high stall and low gearing
• 100% wet-flow tested by Holley technicians to make sure it’s ready to run!

• Barrels: 4
• Booster: Down Leg
• CFM: 850
• Choke: Manual
• Emission Code: 3
• Finish: Gold Dichromate
• Fuel: Gasoline
• Fuel Inlet: Dual
• Material: Zinc
• Model: 4150
• Primary Main Jet: 80
• Primary Power Valve: 6.5
• Primary Pump Nozzle Size: 31
• Product Type: 4150 Model Carburetor
• Secondaries: Mechanical
• Secondary Main Jet: 80
• Secondary Pump Nozzle Size: 31
• Supercharged Application: No
• Throttle Bore: 1.750 inch
• Vacuum Ports: 1 timed (spark) port, 1 full, and 1 PCV port
• Warranty: Limited 90 Day

• This carburetor features a square bore flange bolt pattern. It can replace Holley, Edelbrock, Carter AFB, and Autolite style carburetors with a 5 3/16" x 5 5/8" bolt pattern. If you have a spreadbore style intake manifold, you’ll need an adapter to install this carburetor, similar to the Mr. Gasket #1932.