well i've been running on it now for a couple of weeks now. no problem. first off, i adjusted the rod angle to 13 degrees so i won't throw too much pressure on the main bearings. second, i have dyno tested it for many many times, running it on the dyno for many hours just to get the right tune. every little thing can effect the drivability of it. ignition plays a good role. the pistons are heat resisted carbon coated to avoid preignition, and did my best to avoid detonation. with hard effort and good brains, tweakin your car to get the best performance is not so easy. and BIG BUCKS plays something huge.