My friend has a 1985 z/28 with 65,000 original miles on it. It has a 350 TPI. It runs excellent, but everytime he starts it up after it's sat for a while, it spits out a little bit of blue-ish smoke. Any idea?

 

[align=left]seals r going, oil is spilling past the rings and burning in the combustion chamber, but when it gets hot they expand and dont leak
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That would be oil going past the valve guide seals, through the guides and into the combustion chamber. Its a common thing.

 

yep happens to my 85 z when she sits for awhile

 

But it doesn't burn anything while driving though, which is a little weird, also considering the miles, and that it isn't beat on. Im kind of thinking a possible small vacuum leak. But that is still a good thought. If you think of anything else let me know.