CR and pump gas question

yellow rose said
It has never been proven that aluminum will tolerate more compression that iron will........

Actually, this is rather in basic metallurgy and thermodynamics.....I suggest you do some reading.

yellow rose said
.......Chamber geometry, plug location, cam timing all have way more affect on detonation than does head materiel.

You are correct, all of these factors impact detonation...along with the head material....and many other factors.