Quote:
Originally Posted by LightNFast
Sorry to state obvious, but all things equal… the iron heads will actually make more power then aluminum but the weight savings will usually overcome the difference.
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They won't unless they're modified as the newer aluminum heads come-tight chambers, bigger valves and better-flowing ports. There's a lot of science in modern aluminum heads. You would need to do a lot of modifying to iron heads to approach modern TrickFlows or AFRs. And then the weight still works against them.