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  1. #1
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    14,071

    Default Indmar Assault 325 - Spark Plug Choices

    Wondering what you guys are running in the Assault 325. Manual says AC 41-932. Not available anymore. Replaced with AC 41-993 a few years back.

    Brain Rinse posted:
    . . .
    Another option for spark plugs on the 325 engines. Stock many came with AC 41-993 Platinums (gapped at .060), but these have been replaced by AC 41-101 Iridium (also gapped at .060)
    . . .

    in this thread:

    https://forum.moomba.com/showthread....ns-Torques-Etc

    So, what have you guys been using? Results? Thoughts?
    My Mom said I'm not allowed to get wet!
    2008 LSV (sold)
    2000 Outback LS (sold)
    LLTR!!!!!!!!



  2. #2
    Join Date
    Dec 2006
    Location
    Tuscaloosa, Alabama
    Posts
    815

    Default

    Hey Kane. Running 41-933 in mine for 2 years. No problems. That's what they crossed the 932's over to
    Jack Beams
    '05 Outback DD
    325HP EFI Indmar

  3. #3
    Join Date
    Apr 2013
    Location
    Knoxville TN
    Posts
    3,065

    Default

    I have the 41-993s. Bought a box of 8, but did not put them in last year. Existing ones looked fine.

    Sent from my P00I using Tapatalk
    2018 Supra SL400

  4. #4
    Join Date
    Aug 2006
    Location
    Millington TN
    Posts
    204

    Default

    If your engine dose not have catalytic converter exhaust, I would recommend using conventional AC/Delco MR43LTS plugs gapped at .045.. Any catalyst engines should use platinum or iridium plugs. The plugs we used in the cat 5.7L engines have superseded to 41-101 gapped at .040.
    Larry Engelbert
    Indmar Marine Engines
    "Power to the Sport"

  5. #5
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    14,071

    Default

    Quote Originally Posted by Engine Nut View Post
    If your engine dose not have catalytic converter exhaust, I would recommend using conventional AC/Delco MR43LTS plugs gapped at .045.. Any catalyst engines should use platinum or iridium plugs. The plugs we used in the cat 5.7L engines have superseded to 41-101 gapped at .040.
    This makes a lot of sense. Think I'm going conventional.
    My Mom said I'm not allowed to get wet!
    2008 LSV (sold)
    2000 Outback LS (sold)
    LLTR!!!!!!!!



  6. #6
    Join Date
    Aug 2007
    Location
    Alpine, Utah
    Posts
    191

    Default

    How many pounds of torque do you use when tightening the plugs on this engine?

    Garn
    Garn
    2007 Mobius LS (Direct Drive)

  7. #7
    Join Date
    Aug 2007
    Location
    Alpine, Utah
    Posts
    191

    Default How tight?

    Quote Originally Posted by Engine Nut View Post
    If your engine dose not have catalytic converter exhaust, I would recommend using conventional AC/Delco MR43LTS plugs gapped at .045.. Any catalyst engines should use platinum or iridium plugs. The plugs we used in the cat 5.7L engines have superseded to 41-101 gapped at .040.
    How much torque do you use when tightening the plugs?

    Garn
    Garn
    2007 Mobius LS (Direct Drive)

  8. #8
    Join Date
    Jan 2008
    Location
    Tallahassee, FL
    Posts
    14,071

    Default

    I would guess 11 lb. ft. but maybe Engine Nut will chime in again.
    My Mom said I'm not allowed to get wet!
    2008 LSV (sold)
    2000 Outback LS (sold)
    LLTR!!!!!!!!



  9. #9
    Join Date
    May 2016
    Location
    West Milwaukee, WI
    Posts
    283

    Default

    I just switched my non-cat 320HP Assault over to MR43LTS. Just one day's use so far, but noticed no ill effects. The wallet really likes them.
    2004 Mobius LS - hooked on footin'
    Former tow: 1986 Chaparral 178 XL, 90hp Merc
    First tow: 197x Glasspar Citation, 135hp Merc

  10. #10
    Join Date
    Aug 2006
    Location
    Millington TN
    Posts
    204

    Default

    Quote Originally Posted by kaneboats View Post
    I would guess 11 lb. ft. but maybe Engine Nut will chime in again.
    11 lb. ft. is the magic number per the GM service manual.
    Larry Engelbert
    Indmar Marine Engines
    "Power to the Sport"

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