Does anyone know what the stock piston stroke length is on a PI motor? My motor was bored .020 over and the cams are def not stock which we thought they were. .535/.535. Stock i think is .505. Im not complaianing but i need to know what is going on here. The guy that built my motor is on vacation and i cant get info untill he returns. I did some research and came up with a stock PI stroke of 3.552. Is that right? Mine is 3.554 . I dunno if this is because of the oversize bore or if he was adding stroke to the motor. My compression is 9.1:1. We are tunning thursday and i want to be able to know exactly whats going on. Sorry if i sound like a idjit here but im not even close to a mechanic LOL.