[RiverRunner]

Cylinder pressure can be built in different ways, including advancing timing (detonation before TDC), turbo charging, higher compression, etc., you're also not taking into account the torque loss differences from some of these. If you took the same engine, and only changed the bore or stroke, nothing else, you may be able to mathematically model the maximum potential change, but you still have to take into account changes intake and exhaust volumes (if cylinder volume or rpm) changes, etc.

I know none of us can wait to see, and put one of these on a Dyno, that will tell us exactly what we want to know.