i'm going to rebuild an engine for my camaro that's been sitting for 2 years now. the engine that was in it was a zz4 motor. it needs to be bored to get rid of rust in the cylinder walls. a knowledgeable friend of mine said some people are having issues punching out late model blocks .030 over. he was saying it makes the cylinder walls too thin because there isn't as much metal on them as the non roller blocks and the end result being coolant in the oil cause of a cracked cylinder wall. anyone else hear of this or have a roller block .030 over with any issues? i've looked for .010 over pistons but can't seem to find them.