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Speedmaster finned aluminum valve covers feature a classic raised
Speedmaster billet aluminum valve bodies are engineered to be a state-of-the-art replacement for your original valve body
If your TH400 transmission is being used in high power applications
Manifolds are cast from steel molds
thicker walls
Chevy LS1 4.125" 393ci Forged Rotating Assembly Kit [3.905] Speedmaster finned aluminum valve coversSpeedmaster Chevy LS1 rotating assembly featuring a precision ground forged 4340 steel crankshaft, 4340 chromoly H beam connecting rods, and forged flat top pistons matched to your bore size.
US$ 119.50
US$ 39.99
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