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These heads come ready for the maximum street/strip Small Block Ford performance possible. These 165cc performance heads are non-emissions legal and come with lightweight 8mm 1.900 intake valves and 1.600 exhaust valves. As well, they come with 58cc combustion chambers and a 70cc ultra high flowing nitrous exhaust port. With AFRs trademark 3/4 thick head deck, its no problem handling that additional cylinder pressure. Each head is also drilled with 1/2 head bolt for maximum head gasket retention as a standard feature of this serious race piece in street design.