[jeepguy1948]

Brent, I’m not an expert by any means but would like to see if I can condense the comments. You seem to want an opinion and short of talking to the engineer that did the original blueprints anybody’s opinion is going to be biased based upon their own experience. If, theoretically, based upon sound engineering princeaples, a number (over bore/wall thickness) was put forward, there would be some that got a less than perfect original casting that would have failed. On the other hand, you could get get an exceptionally thick casting that would tolerate a much bigger overbore. If you are looking for a hypothetical number based upon original blueprints, that’s a commendable question for sure but there are very few (if any of us) qualified to answer the question in an unbiased opinion. Real life experience is all we have to go by. I’m not saying that your question is unreasonable or unanswerable but few if any of us are qualified to answer it.