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dgood

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  1. dgood
    Unless you're racing, stick with the revised spec, the Iridium plugs (they are actually NGK OEM) The platinum plugs were superceded in 2003. GM P/N 12571164 with AC Delco P/N 41-985 old thread here also: http://www.gm-trucks.com/forums/topic/53417-ac-delco-spark-plugs/

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