Quote:
Originally Posted by blykins
I don't think I have heard anyone say that the material makes the flow different, but typically, your aftermarket heads are all aluminum, and they are the ones that will most likely yield aftermarket performance...
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No, me either, but I have had people dismiss cast iron as low performance junk and act like aluminum equal performance. It's the porting not the material it is made from. There are some aluminum heads sold that are not significantly different from the factory cast iron.