thanks for the clearing up clearance for the piston to cylinder issue.The pistons are Keith black hypers.he has already honed the block and there is no damage to the cylinder walls, the reason that the engine is out is because it developed a knock at 631 miles, i do believe that the block is 1983 casting. He told me that the knock is from a bad rod when he was checking one of the rods he found a shadow at the point where the cap and rod meet, ever heard of that before? also is it possible to replace just two pistons using the same bore 40ths over?I have two plstons will very little scoring on the skirt.and thats maybe why he's tell me that i should bore it.I really do value all of the input that you guy have given me it will help make a decision on what to do. I'am starting to think he's trying to empty my wallet.