Like I said, your results may vary.
I will rely on my 26 years of engine building and dyno testing experience and believe the results to be accurate.

You make a few assumptions on my 446/493 comparison about the valvetrain.
Since you have already made up your mind that my testing is somehow invalid I won't continue to argue about it, but will only add that for both of those motors there were no signs of any valvetrain instability to well beyond the point where the hp peaks occurred.