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If you purchase the AC DELCO Iridiums you dont need to gap them, they come gapped at .040 from the factory. Just put them right in but I believe the actually gap from the original plugs is .0425. Just put them in right out of the box because the gap will naturally widen as you drive the car into the optimum gap range which is .040- .045

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Q: What is the spark plugs gap on a 2003 trailblazer?
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