Quote:
Originally Posted by deuce_roadster
Perhaps your machinist did a sonic test and determined there was enough core shift to make the recommendation he did. If it were me, I would listen to him.
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The key word here is "perhaps". It has been my experience that, unless experienced with flatheads, most of these guys do the great majority of their work on modern engines with thin wall castings, and are most comfortable with the smallest overbore possible.
IF the guy sonic tested it and
IF he found significant core shift, listen to him. Otherwise, go for the increased displacement; as I said, it is usually free. I would at least check it out as it would be valuable knowledge you should have.
These days, guys talk "superchargers and nitrous"; back in the day, it was "bored and stroked".