Alloy heads

The funny thing is, that I believe that the smart people on both sides of this discussion are correct.

As a purely technical question there really can’t be an argument against the ability of aluminum to conduct heat more than cast iron.

Build me two sets of heads. IDENTICAL in every aspect but the material they are made out of. Build a short block, it doesn’t really matter how it’s built. Run it with each set and measure the chamber temperature/pressure.

Two questions, does anyone really think the aluminum head will have a higher peak temp/pressure? No.

Is it a fair comparison if we allow 5-6 different variables into the question? No.

The science is indisputable, but we live in the real world where manufactures don’t make IDENTICAL parts in different materials. Does aluminum transfer heat faster? absolutely, are there a multitude of things that matter more? Absolutely.