Yes, the SR and the -1 have raised exhaust ports which on this engine probably would improve the power a fair amount. Also, the -1 heads have larger intake runners. So even though they flow roughly the same, the extra volume would probably help make more power.

But changing heads is not part of the plan. I already know that better heads would make more power. -1 heads would make more power, then B1 heads would make even more power and then Predator heads would make even more power.

I'm more interested in sticking with one basic combination and sorting it out. So I'll just stick with the EZ heads and see where it goes. 900 hp seems like a reasonable goal at this point.

Biggest debate I'm having at the moment is if I should stay with the 4.440 x 4.150, or increase the stroke. I could slide a 4.50 crank in there to pick up the size as well as the compression. I'm just not sure that bigger is better when the motor is already limited by the heads. Maybe smaller with more RPM makes more power?