360 stroker how much HP is picked up if everything else stays the same?

You can spell it out for me, but you're talking about increasing the force. I'm not :rolleyes:
I'm talking about the same force over a larger area. When you increase the area, for a given weight, you reduce the force per square inch. In fact, if you make the area small enough, one surface will start to dig into the other and increase friction..
Think of walking in the snow, first with regular shoes, then with snow shoes. Or skiing, getting dragged along by your feet, or getting dragged along on ski's.
Obviously the surface has an affect on friction.
That post in 89 I made is quoted from a physics book, so take it or leave it.