[Bruce Edwards]

Yes you can do it with aluminum heads and the right cam. Would need some fine tuning to keep it from knocking when hot. With a good cooling system you should be able to do it. I have built them up to 12 to one on a 427 with iron heads but they were new Medium riser heads that we polished as well as the piston tops. The trick is not giving the pistons or heads any place to build up a hot spot that will start the knock.