If you could keep the comp ratio high it would produce more power and have a much harder/viscious power delivery but you would need to run stand alone management to get a precise setup and high octane(race fuel)At this level it would become very volitile and even steel crank and rods wouldnt take abuse the slighest imperfection in fuelling/ignition would create. 9:1 is runable at 300 bhp but reliablity or even life expectancy of that engine would be close to nothing.