4 Barrel Billet Aluminum Carburetor Main Body - 4150 Double Pumper [Red] An engine with a 4340

An engine with a 4340 billet steel crankshaft will rev faster and cleaner due to the different harmonics produced from the high grade material

Silicon aluminum is the choice for many of today's engine manufacturers because of its high fatigue strength and superior temperature threshold

Speedmaster water pump spacers are fully machined from aluminum to fit your needs in function and style

Speedmaster hydraulic roller camshafts are offered in a wide variety of profiles

6 pinion gear

4 Barrel Billet Aluminum Carburetor Main Body - 4150 Double Pumper [Red] An engine with a 4340This 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.