Sorry James, to get back to the original question. Well I know from personal experience what these little engines will take with proper care. I know for a fact from my own experience that 600 turbo HP is no problem for a stock Chrysler block. How much will it take? I intend to find out, as Maddart is fixing to do the same. My bet is well over 1200. Been to 1000 already, with a stock crank no less.