The spark plugs in my 2002 Silverado required a .060 spark plug gap to be factory adjusted. I decided to change them at 70,000 miles and the spark plugs were preset at .060. With a circulation of 140,000, it's time to replace them again. ACDELCO candles (41-962) have been preset to 0.040. I should see if GM has done a rework before proceeding. As always, I'll buy my next set of plugs from an auto parts store. Less stress.
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