340 x-block vs. 410 stroker ?

j par said

I assume you have an open chamber heads of some sort or a very thick head gasket?

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Yes, open chambers with a gasket I detest. If I can find a gasket that I like that isn't 100 bucks each I'd drop down to an .039 gasket and make it 11.25:1 instead of the 11.08:1 it is now.