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  1. M

    Compatible AC Delco Iridium Spark Plug Replacement P/N

    Thank you for the additional info and bulletin link. I am happier about this upgrade now. I guess I was beginning to think the coils may have been different back in '03 and somehow related.
  2. M

    Compatible AC Delco Iridium Spark Plug Replacement P/N

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

    Compatible AC Delco Iridium Spark Plug Replacement P/N

    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.
  4. M

    Compatible AC Delco Iridium Spark Plug Replacement P/N

    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...
  5. M

    Compatible AC Delco Iridium Spark Plug Replacement P/N

    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.

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