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If your TH400 transmission is being used in high power applications
Make valve cover installation and removal easy and hassle-free with Speedmaster allen head valve cover bolts
Manifolds are cast from steel molds
don't forget to get the correct transmission yoke for your application
Speedmaster billet aluminum valve bodies are engineered to be a state-of-the-art replacement for your original valve body
Chevy LS1 4.125" 393ci Forged Rotating Assembly Kit [3.905] If your TH400 transmission isSpeedmaster 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.
