Like already said, the service bulletin for spark plugs was because they started using iridium instead of platinum, the .060 was platinum, .040 for iridium. The service message date was from late Oct 2003, so the complete phase in was probably 2004. Also as spark plugs age and wear, they erode at the tips which will also increase the gap.
Just a tid bit of info here which I think is ridiculous. GM specs for oil consumption per warranty guidelines for acceptable consumption are 1qt per 2,000 miles, and if over 8600 GVW 1qt per 100 gallons. Its not just GM, these specs are par with all manufacturers too, at least the ones I checked on.
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