max compression on pump gas\steel cylinder head\241 @ 50 cam

I wonder how much power you can gain, going from lets say 150 psi of cylinder pressure to 170 psi??
Has there been a cylinder pressure test on a dyno before????
Now that i think of it, there was a couple of dyno test with advancing the cams position and what it's affects where.
I will try to find it.
Thanks for all the information.:supz: