Re: Calling Ol'Ron, calling Ol'Ron...
Ask your machinist why he wants to stick with the small overbore. Has he documented thin cylinder walls or a core shift with sonic testing, or is he just applying his experience with modern thin wall castings? Like Ron says, "Whe[n] building a street engine you [want] low end need torque. The only thing that gives you this is compression and displacement. .060 or .125 would cost almost the same as .030" and give you more displacement and compression". This has been my experience as well. Back in the day, a lot of guys took these engines to 3 3/8"+.030 or even 3 7/16", so an 1/8" (.125) still leaves you with plenty of meat for the future unless a specific problem exists. You should really talk to your machinist because you should know about any such problems with the block.
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