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I have the specs on the pistons vs different head gasket and head CC combinations. My last 273 was .060 over. No problems.

The pistons are the old school Badgers. The tops have been machined to get the cr down plus they are a little lighter



.060 over, some head work, and a good intake with a 4-barrel carb should wake up a 273 quite a bit and make it run pretty nicely.