4 Barrel Billet Aluminum Carburetor Main Body - 4150 Double Pumper [Red] They are designed to work

They are designed to work with factory

they replace your existing worn or damaged valve seats

a cable retention ring

flush-machined set screws for proper contact on the studs

Designed to look standard under your bonnet

4 Barrel Billet Aluminum Carburetor Main Body - 4150 Double Pumper [Red] They are designed to workThis Speedmaster design features tubes instead of discharge nozzles that provide a more consistent fuel flow. Want to upgrade your street carburetor to a high performance race carb but don't have the means to do a complete carb swap? If you can turn a screwdriver, you can get 25 to 50 HP from these Proform main bodies. With no air horn, choke tower, or choke control to restrict airflow, they deliver extra power easily and affordably.