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Re: spark plugs
I am changing the plugs on my 2002 Silvy HD 6.0, and since I have put 93,000 miles on this set, I figured I would replace them with whatever came out. Turns out AC/Delco plug and the only marking on it is "12". (And "Made in USA"). Nothing else anywhere. I can't find the AC #12 plug at any of the local parts stores, or the Autozone and O'Reilly websites. The show a P/N 41-110, is that that the same? Crazy thing is, the owners manual specifies only 2 plugs, an NGK P/N, and a Denso P/N. (Why only 2 Japanese plugs and no GM/AC Delco???). Anyway, the plug I pulled looks perfect, not too hot or cold. May even be the originals, (Truck had 97K on it when I bought it, now at 190,000). Gap is worn very wide, .100", still running good, with occasional miss at idle. So where do I get an AC/Delco 12, or does anyone have a cross-reference to another P/N? Definitely gonna stick with a GM/AC/Delco plug, I'd be a fool not to, in this case.
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-Jim
2015 Silverado Crew Cab 2500HD 6.6 Duramax 4x4
2002 Silverado Crewcab HD 2500 6.0 4x4 Sold 281K Great Truck
1970 Chevelle SS454 (Gave to my son 9 years ago for his 18th birthday. Yeah, I know, crazy, right? Thank goodness he doesn't drive it the way I would, -er, did...). 
1971 Monte Carlo SS454 Drag Racer. The old girl finally got new paint!
1968 Camaro SS (New race car project). Caged, Tubbed, Back-Half/Ladder Bars. Rolling Chassis (For now).
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