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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That is my reason for "wanting " alu heads , pings once in a while , especially if I can't find 94 octane (1.70 /litre ) . Plus the weight saving , every pound helps .