I have a 88 ZC engine with new piston rings and it keeps smoking it just got rebuilt. The block was bored .020 and the rings and pistons were changed accordingly. So far i have drove 350 miles and it still is smoking the guy who did the rebuild for me said it should stop smoking in a thousand miles or so i think he is full of it. i have never drove it over 3k RPMs and changed the oil once after 200 miles. Why the hell is it still smoking i don't think its normal any suggestions in break-in and why its happening would be greatly appreciated.