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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.  1/24025 Update - Since this article was written we now offer a less expensive alternative to the Time Sert 5600 kit, see the 389XL for the largest Ford Spark Plug Thread Rep …