not done owt wrong was just acceleratin in 4th gear shut power off an the car back fired an the engine ad a little rattle on it but still ran ok i knew wot ad happened so didnt accelerate went home an compression checked the day after an number 2 was way down so was lucky to catch it its not gud considerin its only runnin stage 1 an the mileage the others another 1 as quite a bend on it an other 2 just slightly bent must of been bent a while obviously cant all bend at the same time but ive prob only done about 2000 miles with this engine in now replaced with scat rods