I was really skeptical about repairing a previously repaired whole spark plug. I seriously considered taking the head out, repairing and restoring it. I'm glad I decided to buy the Big Cert kit instead. This is a very high quality set with clear instructions. The entire process took less than an hour including replacing all the spark plugs and cleaning. I was really impressed with the solution. Good product! Kind of wish I had more whole ones to fix.
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