I've never thought about it; what determines the opening and closing events of the valves on the cam card? IE set intake opening at 28* as opposed to 34*. I'm assuming it has the do with the Crank/piston position to achieve max cylinder pressure or some other thing, but what determines it ?
You can retard or advance the cam to move the power around but for the most part doesn't the power stay about the same you just move the rpm. At some point though I guess the Cylinder pressure will drop off and you'll lose power.
I figure someone here would know, even if Straub doesn't see this.