Originally posted by canibalchicken
Why would you want to trade a TH400 for a TH350?
Well if he is building a small block combination, you are much better off with a turbo 350, turbo 400's will eat up power from Small Blocks making mid-range power. The guts of the turbo 400 are much heavier, and this can eat up to 60-70 hp from a small block, where as with a big block because the engine has a larger rotating mass, it equals out causing less horsepower loss through out the drivetrain. Turbo 350 guts are a lot lighter, but are still quite strong, and in turn may only suck 4-7 horsepower from the engine.

69c10