Did any of those S10 Blazers have over 150k? I have never seen a high mileage 4.3 that didn't some like a freight train at startup. They are notorious for valve stem seals.
Not ours, sold all of them in the 130k range. A friend of ours had over 200k on his 92 (original owner) and it didn't smoke. Have a friend with a 96 Vortec 350 Silverado with 280k on it (it is the original engine) and it doesn't smoke like a chimney either. Maybe older ones like 87-91 (the TBI ones) do that because I have seen the same on the TBI 350s.
