pump gas will absolutley limit hp, dont fool yourself into thinking u can work around your chosen fuels limitations, when building a engine, fuel, intended usage are first considerations. i limit pump gas street engines to about 190-200 lbs max cranking compression after longer duration higher lift cams degreed, heads milled/squish minimized. bigger bore bikes, busa/zx14 i can pump 225-230 same cam/compression mods on stk pistons but pump gas senerio gone as it is unsafe. also cant lower cranking compression to what seems safe on pump gas by moving cam timing higher, that compression returns at high rpm's. cant get it all on pump fuel, especially street ridden where heat becomes a factor. fuel/tuning become critical on high compression engines running top end for any distance. lower compression motor safer, practically as fast, just lacks the torque to get to top speed as quickley from less compression factor. google hp vrs compression charts, some surprising info results.