Compatible AC Delco Iridium Spark Plug Replacement P/N

Discussion in 'Engine & Drivetrain' started by Mr_Bill, Mar 16, 2019.

  1. Mr_Bill

    Mr_Bill TYF Newbie

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    I cannot seem to find an AC Delco Iridium part number to replace the original platinum plugs (41-974) in our '03 Yukon, 5.3 L engine. We are at the 100k mile service and would like to upgrade to the iridium plugs. Thanks for any help/advice.
     
  2. 915_Tahoe

    915_Tahoe Full Access Member

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    From gm I didn't see iridiums, but I did find these other then the original equipment plug.
    Gm#19299585 $11.02 ech
    Double platinum
     
  3. HiHoeSilver

    HiHoeSilver Away!

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    41-110
     
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  4. Mr_Bill

    Mr_Bill TYF Newbie

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    Thank you for your help. I did see where double platinum is an upgrade from the original single platinum. But, the local GM dealer said they install iridium plugs. Assuming they use GM parts, I was trying to locate Delco's compatible iridium plugs. Maybe it is only available for late model Tahoe/Yukons perhaps with a slight engine modification.
     
  5. Mr_Bill

    Mr_Bill TYF Newbie

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    Thank you for your help. I checked this Delco iridium plug (41-110) at a few parts sites, but they all say this plug will not fit our '03 Yukon 5.3 L engine. Maybe it is only for newer engines.
     
  6. HiHoeSilver

    HiHoeSilver Away!

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    It fits.
    The 974 & 985 were all superceded by 110. Later to save costs, they started listing the 962 platinum. Use the 110.

    Also, to save you the trouble now, they changed the gap. The 110 will come pregapped at .04. Don't try to change it, just check them before install.
     
    Last edited: Mar 17, 2019
  7. Mr_Bill

    Mr_Bill TYF Newbie

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    GREAT! Thanks so much for your help and useful info. Sounds like the 110 is the way to go.
     
  8. afpj

    afpj Full Access Member

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  9. Mr_Bill

    Mr_Bill TYF Newbie

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  10. Merc1973

    Merc1973 Full Access Member

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    Are the single or Double Platinum AC Delco ok to use?
     
    Last edited: Mar 18, 2019

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