[ted]

Concerning overbores, sonic testing will help determine how much can be safely bored from any block. There are enough variances in cylinder wall thickness either due to core shift or the particular mold being used to mandate this if boring a block over 0.040". The good thing about knowing where the core shift is in the block is that the cylinders can be offset bored into the thicker side of the cylinder so that the cylinder wall thickness can be equalized while also gaining some additional overbore that would not have been available otherwise.

As a rule, unless you're just going for the biggest, baddest boy on the block, then always bore to the minimum amount possible. I like starting with .020 which then allows the next build to be .040, the one after that .060, and so on.