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plugs
when i rebuilt the head on my engine that is what my plugs looked like, it was a combination of headgasket leaking and the valve stem seals, mostly the seals, that is also what the valves in that cylider looked like(your #2 plug), it was a very slow and painful cleanup that resulted in me just getting new valves and seals and polishing the combustion chamber a little to get the rest off the head.
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