Swapping from iron to aluminum heads

Bad Sport said

I could be mistaken, but I don't think it's "want", I think it's "you can" run more compression because they dissipate heat better.

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ditto, youll actually lose HP going from an iron to AL if the CFM and CR are identical due to said heat dissipation. You may want to look into MLS gaskets too as AL on an iron block will have more movement.