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5.3 Spark Plug Gap

This is a discussion on 5.3 Spark Plug Gap within the Technical / Maintenance forums, part of the General Discussion category; My 02 Silverado just turned 100k miles, so I thought I'd replace the spark plugs. I bought ACDelco 41-110 plugs ...

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    5.3 Spark Plug Gap


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    My 02 Silverado just turned 100k miles, so I thought I'd replace the spark plugs. I bought ACDelco 41-110 plugs and they are gapped at .040". The dealers" book calls for .040 also. My owners manual and the tag under the hood calls for .060". Can the iridium plugs be regapped from .040" to .060" or have the specs changed from .060" to .040"? Don't really know which is right. Any help would be appreciated.

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    Re: 5.3 Spark Plug Gap

    Subject: Information on New Spark Plugs and Gapping #03-06-04-060 - (10/24/2003)



    Models: 2004 Buick Ranier

    2002-2004 Cadillac Escalade, Escalade EXT

    2003-2004 Cadillac Escalade ESV

    2004 Cadillac CTS-V

    1997-2004 Chevrolet Corvette

    1998-2002 Chevrolet Camaro

    1999-2004 Chevrolet Silverado

    2000-2004 Chevrolet Suburban, Tahoe

    2002-2004 Chevrolet Avalanche

    2003-2004 Chevrolet Express, TrailBlazer

    1999-2004 GMC Sierra

    2000-2004 GMC Yukon, Yukon XL

    2001-2004 GMC Yukon Denali, Yukon XL Denali

    2002-2004 GMC Sierra Denali

    2003-2004 GMC Envoy XL

    1998-2002 Pontiac Firebird

    2004 Pontiac GTO

    2003-2004 Hummer H2

    with 4.8L, 5.3L, 5.7L or 6.0L V-8 Engine (VINs V, P, T, Z, G, S, N, U -- RPOs LR4, LM4, LM7, L59, LS1, LS6, LQ9, LQ4)




    --------------------------------------------------------------------------------

    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 1.01mm (0.040 inches) when the spark plug is made. The spark plug gap is set during manufacturing and should not be changed or damage to the spark plug may result. Any new spark plug found to not be properly gapped should not be used..

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    Re: 5.3 Spark Plug Gap

    Thanks, desrtrat, I appreciate the info.

    gary

  4. #4
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    Re: 5.3 Spark Plug Gap

    Whether you use Iridium, Platinum, or Copper; gap should be .040"

 

 

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