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Hi Mike,
I know that photo was excellent before you had to smush it into the gallery limits, and you can see a greater contrast between the two plugs than can I. It reminds me of what I might expect to see if the #4 valve guides would be a little more worn than the rest and it stem seal hard and brittle.
You were looking for a theory on the difference, right?
--
Art Benstein near Baltimore
A dog teaches a boy fidelity, perseverance, and to turn around three times before lying down. -Robert Benchley
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