Proper iridium spark plug gap

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dajani

08-05-2008, 10:45 PM

I bought plugs, AC Delco #41-985, and was planning to gap them to the recommended .060" for my 2001 Yukon XL 5.3. I have seen several sites on the internet that recommend not changing the gap on these AC Delco iridium plugs from .040". Do I gap these plugs to .060" or .040"?

maxwedge

08-06-2008, 03:59 PM

Set them at the GM recommended setting for your truck

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