i did the heads, cam, and gaskets on my 85 tpi z28 because it was smokining really bad. after i got it running it was still smoking with the entire exhuast system hooked up. i disconnected right after my exhuast manifolds and no more smoke. it sounds like to me that the ex. system is full of oil and crap and needs to be cleaned or replaced. anyone every run into this? your thoughts are appreciated.