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WiseAutoTools.com © Summary: Help is here for cases where the Dorman Cylinder Head Repair has failed and has made the spark plug hole too big to fix with a parts store kit. We get calls frequently from vehicle owners and auto repair shops that are looking for a spark plug thread repair that works when a Dorman 42025 spark plug thread (cylinder head) DIY repair kit has failed.  Napa calls it the Spark Plug Re-threader Kit and Advance Auto Parts calls it "Help Cylinder Head Repair Kit". …