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Hi and thanks, as always, to you all for your help/suggestions. Yes, this is K-jet (I have LH version 1, I think, in my 1983) so thankfully no AMM (which I had to replace in the 83 - with help from here in diagnosing).
No loose plugs here at all. Indeed, to budge #1 I had to put a breaker bar on the plug socket. I could not have put that in and it makes me wonder if I have even looked at these plugs since the new head got put it (the first new head failed rather quickly due to lousy quality exhaust studs just disintegrating and falling off - which was the reason I had the work done in the 1st place).
Once I saw this I immediately checked the oil filler cap, inspected the oil in the puddles below the cam lobes, etc for sludge or such. I know well what it looks like because I found that in my wife's 1983 BMW TWICE (before and after head jobs) - which was the reason we dumped it at the BMW dealer and she finally took my advice to get a 240 (she hasn't looked back - isn't vindication wonderful?). So no sign of water in the oil and no loss of coolant or more than normal oil loss for a rig this age (my 83 looses more but that is due to a seemingly incurable leak).
I cleaned and put the same plug into the same position and have taken the car for a couple, short test drives without any sign of trouble (including visual checks of the plugs once cooled-down). I suppose this could be a one-time gremlin. But that seems mostly wishful thinking and I doubt it. So I will try some of your suggestions to see what, if anything, I can ascertain.
This is dino oil! I always thought that synthetic would not do anything special in such an old engine. I really know nothing about the stuff. But if Art says it is a sort of problem-solver, I gotta listen!
I have to admit that I cannot recall when I last changed these plugs (or any plugs for that matter). Back in my old VW days, we did them every 3K miles along with everything else. But it seems they can go forever these days unless somehow damaged. They have just never looked damaged so I always just clean, re-gap, and put them back. These are NGK BPR6ES, I think - whatever is spec'ed/sold for this car at IPD - which is my usual source for such things.
I will post back as I discover/rule out more. Thanks!
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