Originally Posted by birkey
I know all that but do the holes go under the piston? If so how do they get any pressure to push them? I'm curious how lateral ports will help seal if they are not connected to the combustion chamber. Are they?
I think where you're getting confused is the top of the piston- above the top ring- is a smaller diameter than the ring lands. Because of this, the area above the top ring is exposed to combustion chamber pressure.
This isn't something that's even needed on 99% of the engines used on the street. Even a regular tension set of 1/16" rings don't gas porting. And 1/16" rings would be something worth looking at if you plan on twisting the engine to 7K rpm.