Thanks for this thread, Bob
It's timely - I was thinking of making one myself, having heard from John Belfield about the engine in his LP4 and another restorer with the same problem. The symptom is water in the oil, which may of course be from other troubles, but Bob's is good advice.
Looks like after 60 or so years these plugs are finally reaching their use by date.
What wonderful motors these flatheads are!
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