I had them on a low comp 360 with a 1.84 valve with very little if any porting. All I can say is that the acceleration was nothing short of astounding, brutal but beautiful all at the same time. It was still pulling at 6000 RPM where the limiter was set on the 6AL
It had a 256 @ 0.050 solid but still made 185 psi on the comp test.