Quote:
Originally Posted by slowbird
No you won't that myth has been busted. HotRod did the test on a SBC same everything but head material and zero difference was found.
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That was one of the more eye opening episodes of engine masters
if i remember right alum had a edge under 4K rpms due to slower moving charge in a cooler intake tract then upper rpms near exactly the same power
their episode wrap up concluded the edge went to alum due to slightly more power in driving range and less weight
Again the exact same head only diff was material
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