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None are repellant, but some absorb heat more readily & some radiate it more efficiently. Copper/brass is used for radiators for this reason, aluminum is good, but takes a larger tube/more fins. Alum. is superior to iron. For example, you can run more compression with aluminum cylinder heads because they run cooler than stock iron.

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14y ago
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Q: What kinda metal is the most heat repellent?
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