I hear it all the time. "Why don't you run aluminum heads". Usually from guys who's car is slower than mine. I'm going to be doing headwork/solid roller cam upgrade this winter I think. I want 475 horse. But I would be happy with 500. And apparently it's not hard. Got a buddy who redid a 360, iron heads, good compression, solid roller, put down 430 at the tires. That's at least 500 at the crank in my book.
I'm also tempted to build a "max effort" all iron small block. Stock block. Stock heads. Pump gas only. See whats the most you can pull out of it. I honestly wouldn't be surprised if you could hit 600 horse on stock stuff with the right amount of work and forethought. It'll just take a little more work.
