Not Ranked
Mat: You should be able to see crosshatching at the bottom of the cylinders even if the engine has 100,000 miles on it. What counts is wear at the top of the cylinders at the upper limit of ring travel. This is where the "ridge" forms and bore "taper" is measured, or the difference in bore diameter at the top less bore diameter at the bottom where there's assumed to be no bore wear.
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Tom
"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough HORSEPOWER." Mark Donohue
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