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depends on the plug you replace it with. IF you use AC delco stock, should be .040. Some of the other plugs require .060 A new spark plug has been released for use in the above vehicles. The new spark plug has an Iridium tip instead of the current Platinum tip. Due to the different tip design, the gap of the spark plug has also changed. The new spark plug, ACDelco Part Number 41-985 (12571164), is gapped to 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not Service bulletin BULLETIN: 03D-J-171 LINE: 41

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Q: What is the spark plug gap on 2003 Chevy silverado 5.3 liter motor?
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