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Good plugs?

This is a discussion on Good plugs? within the External Engine forums, part of the LSx Technical Help Section category; I'm looking to get an idea for a good spark plug for my car. It's only lightly modified right now ...

  1. #1
    Junior Member 1WickedWS6's Avatar
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    Good plugs?

    I'm looking to get an idea for a good spark plug for my car. It's only lightly modified right now (full exhaust and an intake lid) and I want to get a good plug that will last me a while without having to change them every year. I've read about a lot of different ones and I can't seem to decide on which ones to get. And I'd just like to get a general consensus as to what everyone else might be running with and has success with. Also some gap suggestions would be a big help as well. Thanks!
    '01 WS.6
    Kooks 1 7/8 LT's / TSP True Duals / UMI: SFC's, Front & Rear Sway Bars, STB / SLP Lid /
    MGW Shifter / Elite Engineering Catch Can / MSD Wires / Denso Iridiums
    '03 Avalanche
    4" Skyjacker / Grabber 33's / MBRP 3" Catback


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    LSX whore allbaugh_04's Avatar
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    I think I used the NGX TR55s. Can't remember the gap.

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    NGK TR55 plugs here as well. If you want a longer change interval, then the AC Delco Iridiums are the way to go.

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    Senior Member JayTA98's Avatar
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    AC delco Iridiums here

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    James Bond Spikito's Avatar
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    2001 3.8 Black - sold
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    just ordered TR55s

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    Member JacobLS1's Avatar
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    Im using "TR5". Only because AAP didnt have TR55. Not sure if there is a difference...

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    Junior Member 1WickedWS6's Avatar
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    Thanks for the input everyone. I'm gonna go for the ACDelco iridiums and hope they last me a long time. Does anyone have an idea as to what gap they should be set to?

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    LSX whore allbaugh_04's Avatar
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    Stock gaps and recommendations for plugs for your vehicle can be found on NGK's website.

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    Anybody ever here about nology silver plugs? Just bought them but havnt put them in yet. Suppose to have better electrical and thermal conductivity the iridium and others! Got em off ebay. I dont know. Im gonna try em!

  10. #10
    Member TA98's Avatar
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    I use TR55's but im switching to AR103's next time around. For a long use plug I would use a ACDelco Iridium.

    And Jacob Advance does carry TR55's they just arent listed for our cars. Theyre stocking number 3951. So just ask for that part number next time.

  11. #11
    Member Nowhereman's Avatar
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    Denso Iridiums.. nothing comes close
    Be who you are and say what you feel 'cause people who mind don't matter, and people who matter don't mind.'
    -Nowhereman

  12. #12
    You've Seen The Butcher GoldenFlame's Avatar
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    I run NGK TR55's in both the Camaro and the Corvette. Both gapped at .060


    Quote Originally Posted by 1WickedWS6 View Post
    Thanks for the input everyone. I'm gonna go for the ACDelco iridiums and hope they last me a long time. Does anyone have an idea as to what gap they should be set to?
    I know the Vette guys leave the gap alone on the iridiums "AC Delco website (and other references) tell you NOT to change the gap from the factory set .040"
    Last edited by GoldenFlame; 01-18-2012 at 09:05 PM.

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    Member Nowhereman's Avatar
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    .040 for em.

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    Junior Member 1WickedWS6's Avatar
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    Awesome. Thanks for the info fellas! Why do you say the Denso iridiums are the best? Last longer? Better performance?

  15. #15
    Member Nowhereman's Avatar
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    Iridiums are not all equal.
    They are made differently with different amounts of Iridium in it's design.
    I build high performance Harley engines and they are real sensitive to things like plugs.
    Having used AC Delco, Autolite, NGK and Densos at one time or another, the Denso's noticably run better cold or hot, clean out quicker, hold gap much longer than the rest and for a two cylinder motor putting out 2 HP per cubic inch, produce a slightly wider torque curve.
    Anyone who rides HDs knows that torque is king.
    If your motor is producing lots of torque, it's producing HP.
    I have them in my LS1, going on 70k miles now.
    We pulled em and checked em, the gaps are right on at .040.
    Changed out the stock wires to MSDs and put em back in.
    They were clean and looked good.
    The motor gives me 19 around town and 27 on the road.
    There's a reason they cost a little more.
    It's the only plug I ever use in my bikes, and LS1.

  16. #16
    Junior Member 1WickedWS6's Avatar
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    That's a pretty convincing write up there man. Maybe I'll give those a try instead. Do you remember a part # for the ones you run in your car?

  17. #17
    Member Nowhereman's Avatar
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    Quote Originally Posted by 1WickedWS6 View Post
    That's a pretty convincing write up there man. Maybe I'll give those a try instead. Do you remember a part # for the ones you run in your car?
    There are two units you can run.
    The performance plug is the IT 16 and the "long life" unit is the ZTJ16R10.
    I use the ZTJ in my LS1 because it is a resistor type.
    Other than that, they are the same.
    The non resistor type I use in my bikes.

  18. #18
    Junior Member 1WickedWS6's Avatar
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    Cool. Thanks for the help!

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    Alright just ignore me! Nobody ever heard of nology silver? Oooook!

  20. #20
    Moderator 35th-ANV-SS's Avatar
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    Quote Originally Posted by Supersport0126 View Post
    Alright just ignore me! Nobody ever heard of nology silver? Oooook!
    I haven't, nor could I find any info on them from car forums I belong to.

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