Apparently, with no core shift, people have gotten away with .125" over. Machining heads for hardened seats sometimes hits water according to my machinist, and others. Not good. If you are using older heads, they probably have enough carbon soak that the seats will be ok anyway with unleaded gas. The extra stroke sounds interesting.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.
