Hi all. Need some advice please . Just tore down my 312 and found out that it has already been bored 80'' oversize. I didn't even know 80'' pistons were available! The ideal solution would be to find another block but there is nothing available here in the UK. My only option is to sleeve it back to standard, which is not a problem as I work in an engine machine shop. I have been trolling the internet looking for information, and people seem to suggest that the 312 is weak on the cylinder walls, would hate to start boring it out and break through into a water jacket. Has anybody resleeved one before?