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  1. #1
    Join Date
    May 2018
    Posts
    7

    Default Correct spark plug gap

    I'm replacing the AC Delco's with the NGK TR5 and am a little confused on the right gap for them. What would be the gap for a 2001 Indmar 350 with the carb. I thought it was .030 but I got information through Skidim that they are gapping at .045 so not real sure.

  2. #2
    Join Date
    Apr 2013
    Location
    Knoxville TN
    Posts
    938

    Default

    The 5.7 Pre Vortex is 0.035. MR43T
    The 5.7 Vortex Carb is 0.03. MR43LTS

    Sent from my P00I using Tapatalk
    2007 Supra SSV 22'

  3. #3
    Join Date
    Apr 2013
    Location
    Knoxville TN
    Posts
    938

    Default

    Those numbers came from an Indmar Spark Plug Chart.
    I did a screen capture b/c forget it.
    Probably can Google the same thing.

    It also lists the plug wires #s.

    Sent from my P00I using Tapatalk
    2007 Supra SSV 22'

  4. #4
    Join Date
    May 2018
    Posts
    7

    Default

    Thanks. It is a Vortec. I pulled a couple of plugs to check and they were gapped about .045. Has always run well though. Guess I'll do the new ones at .030.

  5. #5
    Join Date
    May 2018
    Posts
    499

    Default

    Plugs wear, especially the copper plugs you are referencing. Measuring used plugs is not an accurate indicator of what the gap should be.


    Sent from my iPhone using Tapatalk

  6. #6

    Default

    Here you can find an interesting article about top 5 spark plugs for Vortec:

    https://autokwix.com/review/best-spa...gs-for-vortec/

  7. #7
    Join Date
    Sep 2005
    Location
    Claytor Lake, VA
    Posts
    463

    Default

    According to NGK the correct gap is 0.040".

    http://partcat.com/ngk
    2005 Mobius LSV
    325 EFI

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