Chevy LS1 4.125" 393ci Forged Rotating Assembly Kit [3.905] Make valve cover installation and

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

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

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

Engineered for high-power street

How do they do it

Chevy LS1 4.125" 393ci Forged Rotating Assembly Kit [3.905] Make valve cover installation andSpeedmaster 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.