Re: smokey startup
From what I have read in various Chevy news groups, the smokey startup is pretty common for the 4.3's. A nice puff of smoke from a cold start, then fine after that... I've heard worn valve guides cited as a possbile reason. Most people have said just continue your regular maintenance, keep up with regular oil changes, and check the oil between changes so it doesn't get too low, and pretty much don't worry about it. Of course, I'm not a mechanic, so coming from me, this is all hearsay. Maybe one of the guru's around here will have a different view.
What I can tell you for sure is my '92 4.3L CPI has been doing the same thing for almost two years now. I recently (two weeks ago) had my emissions tested, and passed, no problem. Although our emissions laws probably aren't as strict here in Phoenix, AZ, I was well below half the legal limit for the three pollutants they check.