When I first looked at pictures and read the thread, I thought Docisin was talking about just the “steam” holes between the cylinders. After really comparing the gaskets, I didn’t realize that there were so many differences between the two. You can really see why the Docisin 235 would overheat using the 261 gasket, but don’t ’see why the first three cylinders on a 261 wouldn’t overheat.

Interesting, I learn something everyday!
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Last edited by Phak1; 10/21/2020 12:41 PM.
Phil
Moderator, The Engine Shop, Interiors and Project Journals

1952 Chevrolet 3100, Three on the Tree, 4:11 torque tube
Updated to: ‘59 235 w/hydraulic lifters, 12v w/alternator, HEI, PCV and Power front Disc Brakes
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