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Oleg: Thanks. I am definitely allowing for everything to go wrong. I've run a budget for a complete rebuild of the engine and, while I don't know if it's a pill I WANT to swallow, I know that if I have to I CAN swallow it. I adjusted valves not that long ago (while following your other advice to fix numerous oil leaks, although there are a few stragglers, probably from the breather or the through-bolts) and the studs were all okay, but I don't want to make any assumptions and will check everything I have access to.
I didn't have the energy in me to pull off enough junk to access the spark plugs and do a leak-down test while the engine was still warm. So I'll do that when it's cold. The PPI leak-down I had done indicated all signs good except some leakage (12 or 14%) on cylinder #4, which they didn't bother to identify as being through the rings or one of the valves. So I'll be watching for that. It's possible that just being driven for the 4 years since then will have tightened that cylinder up--but equally possible that it's now looser along with its friends and neighbors. So we'll see where the numbers are and where the air is going and decide whether and how far to rebuild.
It appears that you're just doing a top-end rebuild. How did you decide to do that? It seems to me like the top is the expensive half of the rebuild, so if you go that far it is not much more expensive or time-consuming to split the case. But I'm a complete novice and would really like to understand your thought process.
I'm trying to remain positive and conservative at the same time. It probably comes across as passive-aggressive: Just the clutch one day, total overhaul the next. But that's how it goes with a Porsche, it seems.
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