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Spark Plugs?? NGK???

This is a discussion on Spark Plugs?? NGK??? within the General Help forums, part of the LSx Technical Help Section category; I have a 98 z28 and would like to know the exact name of the NGK plugs alot of you ...

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    I lika da Chevy's LETHALxLS1's Avatar
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    Spark Plugs?? NGK???

    I have a 98 z28 and would like to know the exact name of the NGK plugs alot of you guys talk about on here. I believe its NGK 555 but are they the v-groove or not?? I was also wondering how long these plugs usually last as well. I want a long lasting plug so maybe you guys could reccomend a good plug for my car if the ngk plugs dont last long. My car is completey stock as well if that matters. Thanks fellas------mike

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    NGK TR55 V-Power are a favorite, and cheap. (NGK stock number 3951). What do you consider long lasting? Once you've changed plugs a couple times it's easy.

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    Quote Originally Posted by 2001NBMZ28 View Post
    NGK TR55 V-Power are a favorite, and cheap. (NGK stock number 3951). What do you consider long lasting? Once you've changed plugs a couple times it's easy.
    My problem is I have a herniated disc in my back and cant do much. What I mean by long lasting is something that wouldnt need changed too often.Is 1 time a year about right for plugs if you dont drive much?? Thanks

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    My TR55's have been in the car a couple years now, only put about 5K/year on it though. You can get better, longer lasting plugs but expect to pay a lot more. My car came with Denso PTJ16R15's.

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    98 z T56 with 122k on factory spark plugs!!!! Still strip GT's any day of the week!! Of course it would not hurt to change them now (or earlier) but I honestly can not tell alot of difference since it was new, although I haven't check my fuel mileage in a while either, but with 117k i was still gettin 26-28 MPG hwy, averaging around 23-26 MPG.

    Point is spark plugs are alot better than they used to be and I (personally) wouldn't be a fanatic about changing them on a factory engine every 5-10K. I have a 05 chevy 2500 4x4 duramax with 70k still running like new. I would think most are good for atleast 80-100K but other's may disagree. Just from my experience!!!!! Also had a 89 toyota 4x4 with 186K when sold and also had factory plugs and wires!! Only problems I have had with spark plugs was when I was 8 and had to replace the spark plug on a go-cart about twice a year.

    If you have a modified engine then things are prob. different, but I would think 50k on any sparkplug should be realistic.

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    Member Jon7I2's Avatar
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    At an LS1 shop near my house the mechanics said about 20,000 on the NGK Tr 555's.

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    TR55 is a plain copper plug, close the the same heat range as an AC-Delco 41-932
    TR55-IV is the v groove plug
    TR55-IX is the Iridium plug.

    The AC-Delco plugs are usually made by NGK.

    The AC-Delco 41-932 and the NGK TR55-IX are theoretically 100,000 mile plugs but I'd regap them around 40K or so.

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    Thank you very much fellas that helps alot

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    those tr-55ix's are freekin expensive tho. all the iridiums are

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    Quote Originally Posted by jeremy_m70 View Post
    98 z T56 with 122k on factory spark plugs!!!! Still strip GT's any day of the week!! Of course it would not hurt to change them now (or earlier) but I honestly can not tell alot of difference since it was new, although I haven't check my fuel mileage in a while either, but with 117k i was still gettin 26-28 MPG hwy, averaging around 23-26 MPG.

    Point is spark plugs are alot better than they used to be and I (personally) wouldn't be a fanatic about changing them on a factory engine every 5-10K. I have a 05 chevy 2500 4x4 duramax with 70k still running like new. I would think most are good for atleast 80-100K but other's may disagree. Just from my experience!!!!! Also had a 89 toyota 4x4 with 186K when sold and also had factory plugs and wires!! Only problems I have had with spark plugs was when I was 8 and had to replace the spark plug on a go-cart about twice a year.

    If you have a modified engine then things are prob. different, but I would think 50k on any sparkplug should be realistic.
    You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.

    The factory plugs have been platinum tipped for a while now( since '96? ), and don't require replacement until 100k, under normal usage. But I drive my cars hard, and will need to check/replace them sooner.
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    Quote Originally Posted by jigger1166 View Post
    You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.

    The factory plugs have been platinum tipped for a while now( since '96? ), and don't require replacement until 100k, under normal usage. But I drive my cars hard, and will need to check/replace them sooner.
    I changed my stock platinum plugs at 80K miles and they were totally shot. The gap was twice what it was supposed to be set at. I was getting a slight misfire between 1-2K RPM, so I figured I better pull them out and replace them.

    I went with AC Delco Iridiums for the new ones, and I've been happy with them.

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    [QUOTE=jigger1166;612207]You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.



    Correct, Diesel has GLOW PLUGS not Spark Plugs, Sorry!! Wasn't thinking about it at that time.

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    [QUOTE=jeremy_m70;613374]
    Quote Originally Posted by jigger1166 View Post
    You have a Duramax engine in your 2500? It's diesel,and there aren't any spark plugs.



    Correct, Diesel has GLOW PLUGS not Spark Plugs, Sorry!! Wasn't thinking about it at that time.

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    The Iridium plugs are great provided you're not past moderate modding. Introduce a higher compression ratio, anything that advances the timing, greatly increases the volumetric efficiency or even a touch of nitrous and they'll be too hot.

    Sad, as they have an outstanding ability to fire into higher compression but you can't pick and choose heat ranges - yet.

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    [QUOTE=jigger1166;613401]
    Quote Originally Posted by jeremy_m70 View Post


    Yeah, I'm sure YOU have never made a mistake!!!!!! I was illustrating my point late that night. At least I'm man enough to admit my mistakes and apologized instead of belittling others.

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    Get The Denso Iridium Part Number It16 You Would Feel The Car Much Better
    Im Using Those

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    [QUOTE=jeremy_m70;614748]
    Quote Originally Posted by jigger1166 View Post



    Yeah, I'm sure YOU have never made a mistake!!!!!! I was illustrating my point late that night. At least I'm man enough to admit my mistakes and apologized instead of belittling others.
    Wow, don't be so sensative.
    I know you made a mistake. We all make them. I was just pointing out that you made a "DOH!" I wasn't belittling you. Sorry you took it that way.

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    Quote Originally Posted by Steve Crowe View Post
    The Iridium plugs are great provided you're not past moderate modding. Introduce a higher compression ratio, anything that advances the timing, greatly increases the volumetric efficiency or even a touch of nitrous and they'll be too hot.

    Sad, as they have an outstanding ability to fire into higher compression but you can't pick and choose heat ranges - yet.
    TR55IX for me........TR6 is heat range colder. Popular for the nitrous guys.

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    If I were shooting serious Nitrous I'd move to copper, probably Autolite 104 or 103. If it's just a mild shot the AC-Delco 41-913 is a tad colder than a TR6 and double plat. Good streetability yet won't burn holes in your piston from pre-detonation.

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