Chevy LS1 4.125" 393ci Forged Rotating Assembly Kit [3.905] Speedmaster billet aluminum valve bodies

Speedmaster billet aluminum valve bodies are engineered to be a state-of-the-art replacement for your original valve body

Make valve cover installation and removal easy and hassle-free with Speedmaster allen head valve cover bolts

don't forget to get the correct transmission yoke for your application

How do they do it

Manifolds are cast from steel molds

Chevy LS1 4.125" 393ci Forged Rotating Assembly Kit [3.905] Speedmaster billet aluminum valve bodiesSpeedmaster 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.