Welcome to 2CarPros. If two of the plugs were damaged in shipping or from the parts house I would return them, it is very easy for the core and porcelain to be damaged that way. You could install them and suddenly have a misfire code due to the plugs. If you are sure they are okay and decide to continue you can find the plug gap on the emissions label under the hood. Or use.040 in or 1.02 mm which is the GM specification.
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Monday, July 15th, 2019 AT 8:04 PM