I've never been able to find a unique factory spark plug part number and correct gap in my '00 Silverado 2500 6.0L, but the center electrode on it is about 500 times thicker than other part numbers I took off . Haven't found any problems with the spark plugs and the engine runs at least as good as the other spark plugs. The spark plugs I took out ranged from .055" to .070" with a .045" gap between them. I don't know if that's correct or not, but it works fine.
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