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What is the correct spark plug gap setting for a 2003 silverado Z71 1500 5.3 liter?
Updated: 10/25/2022
Wiki User
∙ 15y agoBest Answer
GM has a bulletin # 03-06-04-060 1999 to 2004 Silverado using a Delco plug # 12571164 {91-985 } the gap is preset to 0.040 " {1.01mm } at the factory and should not be adjusted as damage may accure. You can check this information at Delcos web site.
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∙ 15y agoThis answer is:
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