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Old 03-21-2011, 09:22 PM
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Default sparkplug gap
does anyone know the spark plug gap on a 07 nb 4.8 silverado??
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Old 03-21-2011, 09:42 PM
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gap should be .040
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Old 03-21-2011, 09:53 PM
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ok thanks
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Old 03-22-2011, 08:32 AM
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The ACdelco comes pre-gapped at .40

I went to .60 on my ngk tr55ix
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Old 03-22-2011, 09:30 AM
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It makes a difference if you switch out the factory iridium plugs for copper plugs (such as NGK TR55's), in which case I would gap them between .055 - .060
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Old 03-22-2011, 10:12 AM
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x2 my tr55s are gapped at 55. stock ac delcos were 40 iirc
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Old 03-22-2011, 10:32 AM
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Have mine gapped at .35 or .40. They were .60 and had idling issues with the blower. Sounds strange but it def helped
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Old 03-22-2011, 11:02 AM
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I got my tr55's gapped at 60, maybe I should try them out at .40 and see if there is a difference.
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Old 03-23-2011, 10:44 PM
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I put em at 40 there just the e3 plugs
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Old 03-24-2011, 11:54 AM
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Originally Posted by graysilverado5.3
I got my tr55's gapped at 60, maybe I should try them out at .40 and see if there is a difference.
If you're NA your current gap should be fine.... .040 is the spec for an iridium plug...

Originally Posted by 4.8chevysilverado07
I put em at 40 there just the e3 plugs
Personally I'd chuck those plugs and get some NGK's or ACDelco's...my personal experience with Bosch plugs has been horrible, as well as everything that I've heard or read about them
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