400 Cylinder Walls Breaking ???

We have had a few serious cylinder problems with the 400 Blocks

We now run exclusively the 400 Cold weather early blocks out of medium
duty trucks. Easiest way to tell is the early casting # PLUS casting number is TWICE
as large on the side of block.

Google John Irving Drag Racer

To see our 400 Roadrunner = Fastest Stock 400 in NHRA Drag Racing