your motor should be fine but i heard some1 was running from cops in tampa 1 time with a stock H22 and used nitrouse topped it out kept spraying heard a back knocking noise didnt think anything of it. went home next morning woke up was even worse took it to ZMR they took the head off and the piston was able to move in a big circle in the cylinder. dont know if the story is true but. wouldnt use any big type of shot of nitrous on anykind of stock motor