"Dude, Quit while you're behind!"... Thats some funny sh!t, I'm gonna remember that.
Quote:
You all can naysay until the cows come home but that won't change the most important fact:
For identical CR's, you do not have an advantage with aluminum heads. They'll both knock at exactly the same point.
Aluminum dissipates heat faster and more effectively than iron. So the theory that it will allow the charge in the cylinder to resist detonation slightly longer than the same charge with an iron head would figure to be true. Not to mention the fact that millions of people have experienced it to be true. 
Now, you're not going to get away with 12:1 compression on pump gas no matter what heads you run.
