Help identify aluminum heads

33IMP said

You are assuming flat tops? I think I would get a cheap inspection camera that plugs into a phone, and look through a plug hole. 11.8 with a 220-something at .050 will be a full-on race gas only engine. (If it IS that high, the first thing I would do is convert to E85 if it's available where you are. )

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I actually spoke to the owner this afternoon who had the motor built and was able to get some particulars. He told me it's 500ci, 10 or 10.5 -1 compression, & originally was built with a 950 but he changed it to the 750 for better fuel mileage. Also the heads are promaxx. . .I'm still going to remove the oil pan and see if I can figure out what crank is in it. . . Also he told me the one valve seal needs to be changed which I'm not thrilled about but I guess it's no big deal