I was asked not to discuss numbers but IME most heads peter out around .7-.800" lift. This things flows BIG numbers w/no turbulence up to 1 inch of lift. The tool won't give any more so we cannot tell if it stops there with a valve in the hole. $20K each for a bare head!!! You oughta see the intake manifold. And the rocker arm ratios are nuts. I'm not a NASCAR fan but I am a gearhead and this engine is unreal.
If you're going to be crazy,you have to get paid for it or you'll get locked up.
Hunter S. Thompson