[chopper]

Keep in mind that nominal wall thickness for the 427 blocks (especially the early ones without the "square cylinders" was only .110 inch to begin with. Taking 0.015 off only leaves 0.095 inch wall thickness nominal. Sleeves are an option. Steve Crist's book recommends no more than 0.030 inch overbore and only sleeving one cylinder per bank. That said, there's at least one 427 block running around out here in AZ which has all eight cylinders sleeved and he says he's doing fine. Critical questions here are whether or not the block was properly checked for cracks and voids (magna-fluxed and sonic checked) and whether the engine was properly assembled.