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NGK Spark plugs

This is a discussion on NGK Spark plugs within the General Help forums, part of the LSx Technical Help Section category; When I got the headers, and cat back done, TR55 plugs were installed also. It seems since then, the p/n ...

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    Senior Member Whamhammer's Avatar
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    NGK Spark plugs

    When I got the headers, and cat back done, TR55 plugs were installed also. It seems since then, the p/n has changed. I have two questions:

    1) What is the correct new P/N?
    2) What is the mileage replacement interval that most have seen on these? 15k? 30k?

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    Moderator 98TransAmWs-6's Avatar
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    3951 is the part number. I'd change them every 20k or so. Get iridium and you'll go much longer.

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    Spaz is My Mentor SMWS6TA's Avatar
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    If you have mild bolt on's I'd recommend going with the Iridium plugs. More bang for your buck and not quite a loss with the spark.

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    Senior Member Whamhammer's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    If you have mild bolt on's I'd recommend going with the Iridium plugs. More bang for your buck and not quite a loss with the spark.
    I am pretty surprised to you two suggesting iridiums, just before I put my headers on, I thought everyone was solidly in the copper plug camp, even with the build I have. Has something changed?

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    Moderator 98TransAmWs-6's Avatar
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    I use copper but I'm heavily modified and there is no iridium option for what I need otherwise I'd be doing iridium for the longer last plugs.

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    Spaz is My Mentor SMWS6TA's Avatar
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    Quote Originally Posted by Whamhammer View Post
    I am pretty surprised to you two suggesting iridium's, just before I put my headers on, I thought everyone was solidly in the copper plug camp, even with the build I have. Has something changed?
    You noticed I said for stock or mild bolt ons. Copper is always better for higher/hotter spark over Iridium, however Iridium does last 3x longer than copper but has a decrease in spark intensity.

    I did try both, when I had just headers, LS6 intake and not taking it to the track. Once I started going to the track more and mod'ing more I had to swap over to the TR55's because the iridium plugs were not lasting as long under the harder load I put on them. When you change plugs every 25k miles or after X amount of track days, like in my case almost 3x's a year it gets expensive buying iridium's.


    Like Will I'm heavily modified, I currently have to use a TR-6 plug for now and may end up going next range down on future mod.

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    I'll be dead and gone most likely before our TR-55's see 25,000 miles.

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    Senior Member Whamhammer's Avatar
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    Quote Originally Posted by pajeff02 View Post
    I'll be dead and gone most likely before our TR-55's see 25,000 miles.
    One of these days, when I get a daily driver, I may share in your sentiment. I will still probably drive it 1-2 days a week to and fro work but that's depending on a fairly substantial promotion. Stranger things have happened though

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    Senior Member Whamhammer's Avatar
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    I'm not doubting the plugs, as I have just picked up another set but how did everyone come to use the TR55's (3951)? The OE specs call for a 40 gap, and a different part number for a NGK plug.
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    Copper core plug versus Iridium is all. I think mine are gapped around .052" or something.

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