Thanks IQ, just wondering for future builds. I know from reading that any if major headwork or porting is required to iron heads, you may as well just go aluminum. I was just wondering what the tipping point was.
I made 442 on track fwhp with stock 906 heads and a big sft cam, single plain/850DP and large tube f/wells, the heads stopped flowing way before the max lift I had, this was with a stock 440-6 block at around 9.8:1. I switched to b/valve 906's ported to approx 265cfm and made 531fwhp....but that was just on my set up.
