They're stock. The engine came out of a 65 Catalina. It was the 325 hp version. They're almost identical to the 77 heads that would have been on a GTO... in fact i don't really know or think that there was any difference. I am getting ready to build a duplicate of this motor, but since Dave at SD Performance isn't doing cast iron heads any more, I will have Kauffman do this next set.
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"I know just enough to keep me here, but not enough to get me out"
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