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Joined: Fri Nov 10th, 2017
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I would clean up the threads, confirm the gap, and put it back in. As far as #4 not going all the way in I would postpone that until I could get a bore scope to take a look at the threads and the interior of the combustion chamber. It might be a simple obstruction, threads that need to be cleaned up (lots of grease on a tap and multiple trips in going a little further each time and cleaning/re-lubing between each pass), or to getting it to TDC and pulling the head for repair.
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Tony
NE ATL
'04 XLT regular cab 3.slo stepside
Semi retirement