Aluminum construction for 43% weight savings
Billet metering blocks & base plates
Black anodized billet aluminum metering blocks and base plate
Built in sight window for simple float adjustments
High–performance fuel curves
The Ultra Double Pumper Carburetors
feature all aluminum construction and are equipped with metering blocks and a base plate made from 6061–T6 billet aluminum. They weigh in at approximately 5 lbs. less than a comparable zinc carburetor.
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.
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.
Hard Core Gray™ w/ black anodized billet aluminum metering blocks/base plate w/ black hardware; Mechanical Secondaries; Electric Choke; Model 4150™