Originally Posted by AFRd_CJ5
And I'd have to disagree with that. It can be done with aluminum heads, and probably even with iron. Your cam profile plays a large factor with what you can get away with.
For what A.J. is doing, there is no way he would be able to make 12:1 work on his budget.
You telling him to slap a set of aluminum heads on, aim for 12:1 and everything will be okay is pretty misleading.