4 Barrel Billet Aluminum Carburetor Main Body - 4150 Double Pumper [Red] a cable retention ring

a cable retention ring

This allows for an efficient fluid transfer

they replace your existing worn or damaged valve seats

Fuel Rail Kit & Throttle Bodies sold separately

Speedmaster roller rockers are available in various ratios

4 Barrel Billet Aluminum Carburetor Main Body - 4150 Double Pumper [Red] a cable retention ringThis 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.