As was said. The cam had a wild ramp speed, and he had to run factory design and weight lifter. The std hyd lifters would compress at high rpms. He didnt tell me exactly where the threshold was. But I know he spun that engine 7200 at the lights. It made 485hp as I recall on the dyno. That's a .030 over 351 Cleveland, 9.5:1 compression. Stock crank, stock rods, stock pistons (ok we all know "stock" is a relative term in NHRA), stock heads and valves, stock iron intake and stock 4?? cfm Autolite Holley with a factory lift cam. Teh duration was super secret as were the lobe designs. But the thing looked like a roller cam..lol. I do know the oil system was basically stock save the high pressure he ran. I like to see a max pressure of 65-70 psi. Any more than that and you're just using hp to create heat.