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The plugs are good to 100,000 miles and should be replaced with AC Delco iridiums. They should come pre-gapped to .040" and care should be taken to not disrupt the protective coating on the plug tips. This coating protects the plug and adds to their long life expectancy. For more info visit our enthusiasts forum at

www.trailvoy.com

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15y ago
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Anonymous

Lvl 1
4y ago

Dont know. Trying to find out.

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Q: What is the spark plug gap in 2006 Trailblazer?
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