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DennisB WiseAutoTools.com © Summary: Ford spark plug thread repair question about an oversized thread repair insert failing and now the spark plug hole that needs to be repaired is even larger. Faced with the grim possibility of replacing the cylinder head on a Ford 6.8 liter engine Adam decides to ask for advice. Question: I have a 6.8 Ford that blew a spark plug out, it already had a Time-Sert insert that was installed with a 5553 spark plug thread repair kit. I was wondering wha …