GM TH400 Forward Clutch and Direct Clutch Assembly w/o Clutches - Racing which allow you to modify

which allow you to modify your cam timing

The high carbon steel material is incredibly strong and can withstand the rigors of the most extreme engines

Speedmaster machined aluminum water pump pulley nose cones are constructed from top-quality 356 aluminum alloy that's heat-treated to T6 specifications

Speedmaster LS-series cylinder heads are rapidly expanding

Put together your own custom exhaust system with these Speedmaster collector reducers

GM TH400 Forward Clutch and Direct Clutch Assembly w/o Clutches - Racing which allow you to modifyThe Speedmaster forward drum and direct drum assembly are designed to withstand high horsepower with their upgraded 36 element sprag design. Speedmaster GM automatic transmission parts are manufactured using the highest quality materials for strength and durability.