OK, so my Dad has a short tail 331 Industrial HEMI, I believe with standard car heads. He bought the motor with the cylinders bored .040 over, new pistons/rings, etc. It, apparently, has developed some cylinder wall damage recently. How much further can he go? Can it be sleaved in order to retain the current piton/ring combo? Before it was installed, he had the block and crank checked out / balanced and assembled with mostly new parts. After assembly, the engine ran for months in the car before the car was driving. He put it on the road and racked up 300+ miles. All seemed fine. One morning he was backing it out of the garage and it kept stalling when he put in gear. He put it back, and took the daily to work. After taking everything back apart, they found a couple of wrist pins in the oil pan, as well as a cap from a silicone tube. He brought the engine into a reputable engine builder who has diagnosed the cylinder wall damage. I don't yet know the extent of the damage, and would assume its only the 1 cylinder affected.