Originally Posted by Shmoo

The distortion isn't created by the guard, but rather the retards that decide to install it by smaking it in with a hammer. It needs to be machined to fit, welded in, the block needs to be redecked, and then the cylinders need to be rebored to correct any out-of-round.

I agree with Westcoaststyle. Screw the work of a block guard and just get it sleeved.