Quote Originally Posted by pat mccarthy View Post
older blocks most all the time are thicker 327 had a 4.000 bore same as a 350 some engine can go to 080to 125 in bbc alot less sbc i never cut a 283 out to 4.000 bore i look at the ones i had in the shop 060 would be max the older block pre 59 may work better if you feel the need to make a 302. cutting them to a bore 4.000 had to do with the core shift at time engine was built .read the front of most makers that sell pistons over size there on guaranty every one will bore past to or past 080 . less you have 20 core blocks and start sonic checking them you may not like what you see i done some most 350 and 283 like to be no more then 040. past that i going to do a sonic check
Thanks for clarifying, Pat. My info about the pre/post '75 blocks came from some "Ask a Mechanic" place from a guy who claimed to be a 30+ year chevy master mechanic, but I'd rather trust your experience ten times over. I have no doubt that Scooter successfully punched a 350 out 0.080", and from what we know (one post) My64 has one already done to that extreme, too, and his question is not about his bore, but about cam recommendations.

Seems we've all (me included ) gotten a bit off track on a new guy's question, IMO. I hope he checks back in and is not too turned off by all of the negative responses.