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Gordon: Sorry if I wasn't clear, #911-103-949-01 contains six sets, but only one head stud was heli-coiled during the complete rebuild in 1992 (bearings and all).
Walt: Thanks for your input. I have heard anecdotally about oil seeping back down into the engine, although I can't say that I fully understand what actually happens. The oil tank sits higher than the engine with only the oil pump preventing oil from flooding the sump. If the oil pump lets oil pass down through and into the sump it would fill first, then the oil return tubes would get flooded and eventually the cam housings. This doesn't sound right to me, but maybe that's exactly what is happening with my engine. If the valve stem seal/valve guide allows for oil to pass through, it will end up inside the exhaust. In that case the oil tank should be near empty after the car sits for while. I should have checked that before I drained the oil...
The trouble with that theory is that smoke comes billowing out immediately after a cold start up and not just after the exhaust gets hot enough for the oil laying in the heat exchanger to start smoking. Maybe the cam housing is full of oil and the valve stem acts as a dipping rod and "pumps" oil into the exhaust port until the oil pump returns all the oil to the tank. That shouldn't take 10 minutes, though. Sorry for rambling on, anyways I don't understand the whole oil seeping back phenomenon.
Appreciate the tipp on the "string theory" - I had not heard of that before.
On oil consumption: I don't drive enough to be concerned about "consumption". As long as there is no visible smoke or smell, I will be happy. But the warm up smoke after it sits for a few weeks is extrem, a real smoke machine and beyond embarrassing that goes on for about 10 minutes after which is suddenly subsides.
Thanks again!
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