Dear Brad;

I'm prety sure that Jahns only made 8:1 sets for the 235" engine. That was a lot in the l950s as pump gas was only 90 octane on a good day.

The 11:1 sets were for the "full race" GMC.

Also; Your right the stock bore on a 235" is 3 9/16.

Good luck, John M., #3370.

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John M., I.I. #3370

"There are no shortcuts to any place worth going". -Anon