That is a totally unsupportable statement. Every dyno is different regardless of the make.
As for 600 HP not being a big deal, maybe it's not considering what they did to get it, a stroker with a tunnel ram. My stock stroke 360 with an M1 single plane 4150 flange with a 900 cfm carb, W5 heads with 2.02 valves and solid flat tappet cam makes 600 HP.
