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Re: Spark plug gap question
FWIW, original equipment plugs for ACDelco have been manufactured by Denso and NGK for years. Some original plugs pulled from engines have been stamped "AC-Delco by NGK" and "Denso" very clearly. Back in the '80s-'90s I worked at a Textron division which headed blank shells for AC-Delco by the millions, among many other OEM parts (valve retainers, crank and rod cap bolts, rocker studs, all sorts of ball joints, starter gears, etc.), and I know that wasn't an isolated incident. GM outsources a lot of the parts used in their products.
What is most important is using a plug with the proper heat range and reach.
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