Your math is right.
If .100 IS okay, then I'm good with .030 removed from the diameter - would leave .117 wall thickness from .132. Allowing for (hopefully no) damage, someday I may need .040, then .060. At 60 years old, I don't think I'll be doing 3 rebuilds on the motor considering it won't be daily driver. I was just curious if .060 could be removed as I'm trying to learn.
While searching, I'd seen .125 and .130 min all around - any boring on my block goes below this. Some Mopar guys say .160 min all around (I don't know where they start). "My" machine shop engine tuner/carb/intake expert (who's learning machining details from owner who's about to retire) said it "should be fine" because thrust sides were .200+ min, but he's not Pontiac. I'd asked on a different forum, and was told to PM Mr. P-body, but never heard back. The info I'll go by came from a guy with screen name CNC BLOCKS NE who seems most experienced.
Have some bad vibes after reading about Eric's 67 GTO nightmare. This shop is similar - been around 45 years, 70-year old owner got sick a few months, work stacked up, my block's been sitting there 6 weeks (was said they could do it in 2-3). Want it cleaned/magnafluxed, bored/honed, zero-decked, and balanced - so far it's just been sonic tested. They want to test bore a corroded cylinder/water setting before proceeding - said if it's bad, may want to sleeve that one. Still need to get pistons so he can match to cylinders (planning on SRP 149721 lightweight forged +.034). Will see how it goes.
Wasn't sure I was going to keep the GTO (had it 30 years), but after coming here, I got the fever again...
Last edited by 60sPontiacs; 07-15-2016 at 03:04 AM.