The new Ultra Double Pumper Carburetors have an enhanced fuel curve for optimum performance, with many more features such as aluminum construction; anodized billet aluminum metering blocks and base plate; 4 corner idle for precise idle control; mechanical secondaries for great performance; clear fuel level sight plugs for easy, no mess fuel level adjustments; Ford automatic transmission kickdown for use on popular Ford transmissions; four vacuum ports for all necessary vacuum accessories; and for the first time on a Double Pumper, factory pre-set electric choke for easy, fast cold start-ups.


Hard Core Gray™ w/ black anodized billet aluminum metering blocks/base plate. Casting is hard coat anodized for ultimate corrosion resistance

Ultra Double Pumpers feature an Optimized street/strip calibration that works out-of-the-box

Factory preset electric choke for easy startups

Mechanical secondaries for awesome tire turning performance

4 corner idle allows you to precisely control your idle system

Built in, clear fuel level sight glass for easy, no mess fuel level adjustments

Aluminum construction for a 43% weight savings

Compatible with GM, Chrysler, and Ford A/T kickdown linkage. Additional parts may be required.

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!


Barrels 4

Billet Color Black

Booster Down Leg

Brand Holley

CFM 750

Choke Electric

Condition New

Emission Code 3

Finish Hard Core Gray

Fuel Gasoline

Fuel Inlet Dual

Marine Use No

Material Aluminum

Model 4150

Primary Main Jet 72

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 28

Supercharged Application No

Throttle Bore 1.688 inch

Vacuum Ports 1 timed (spark) port, 2 full, and 1 PCV port

More Information
Part Type Carburettors
Product Line Air & Fuel Delivery
Brand Holley
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