Re: aluminum heads
Ford L-head V8s have a trade off point between good breathing and compression ratio. So many of the aluminum heads have chambers that are good for compression but may not help with breathing or flow due to the chamber's shape.
The research JWL has in his book is excellent for answering many performance questions. It's hard to say whether cylinder head design or composition has anything to do with overheating. I'd figure it to be a very minor variable unless the coolant flow in the head is poor.
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