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Ron Z.
Ron Z., - Chevy Tech -
Category: Chevy
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Experience:  18+yrs experience. State Inspector and Chevy Diagnostics
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What is the spark plug gap for a 2003 Chevy silveradeo 2500 hd 6.

Resolved Question:

what is the spark plug gap for a 2003 Chevy silveradeo 2500 hd 6.0 engine
Submitted: 6 years ago.
Category: Chevy
Expert:  Ron Z. replied 6 years ago.




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 P/N 12571164 with AC Delco P/N 41-985 is gapped to 1.01 mm (0.040 in) when the spark plug is made.

Edited by DriveFast1971 on 10/25/2010 at 4:57 PM EST
Expert:  Ron Z. replied 6 years ago.

If you are not using the Iridium tip design, the gap is .060 in. If you are using the Iridium tip and/or the AC Delco P/N 41-985 then the plug is pre-gapped at .040 in. Always double check the gap for accuracy, even new from the box.


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