Well it floated the valves at 5200 and is where the power peak was, its not together anymore but those heads with better springs pull way past that on my 340 now. It used the Hughes .491/.500 roller cam, out of the box RPM intake. I was using this infront of a 727 w/ 3500 shelf converter on a 4.56 gear. It saddens me that the block cracked in the winter because I could have made it run alot stronger than it was with springs and rebuilding the frontend that was squalling the front tires from mid track on.