340 build

true enough. The problem comes at 0 to 15degrees after TDC for the intake valve on the intake stroke, and 0 to 15degrees before TDC on the exhaust stroke. I've never done it, but if you Google "flycutting pistons" on the Corvette forum, some guy explains it pretty well, with pics and drawings. I guess I was full of cap about using a power drill, he says you'll take too much off with a power tool. He recommended doing it by hand with a tap handle.