I found this on Corner carvers. Not sure if it relates directly to my situation, but it might.
Quote:
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Originally Posted by GlennF at c-c.com
If it blows a pretty good puff of blue smoke on startup after a warm shutdown and a long sitting period it is most likely a valve seal/guide issue. If the smoke seems to get worse under higher load and RPM it is most likely a piston/ring issue.
Smoke while under load is due to ring flutter and oil entering the combustion chamber past the rings. This could be worn ring grooves in the piston, rings that have lost their tension or ring/cylinder wall wear issues.
Valve seal and guide problems are more evident during light load conditions when engine vacuum is high. High vacuum in the intake port coupled with crankcase pressure tends to draw oil through hard, worn seals or past valve stems with excessive stem-to-guide clearance. Decelerating in gear will also lead to smoking if this is the case.
Another thing to check would be to insure you have a good PCV valve and that the screen in the back of intake is in place. Wouldn't hurt to check that intake manifold bolts are tight as well.
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