Sonic check to be certain. After spending hours cleaning and painting my 283 I took it to Fowlers machine shop here in town to have it sonic tested and the crook that came out to take it out of the back of the van demanded they clean it first(extra charges) and I told him I had a little more sense than to fall for his rude ways to manufacture work for them and to forget it! I stuck with a .060" over,,,at another shop of course. They should have had to pay for my gas to get there. Crooks,,,,I know when a motor is clean as well as a grown-up! I'm only 53