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spark plug gapping

This is a discussion on spark plug gapping within the General Help forums, part of the LSx Technical Help Section category; im going to put new TR 55's in my car and i was wondering what is the best gapping for ...

  1. #1
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    spark plug gapping

    im going to put new TR 55's in my car and i was wondering what is the best gapping for my car? i have a 99 trans am automatic with longtube headers and a cold air kit.

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    None Shall Pass Knight's Avatar
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    .055 is what I use.
    Last edited by Knight; 03-05-2011 at 06:14 PM.

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    None Shall Pass Knight's Avatar
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    ^^

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    Moderator Cutlass's Avatar
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    For a mostly stock engine, gap those plugs at .050". Some people will say a little more gap, some will say a little less gap. And they are all right. I put mine at .050"
    as long as your not way off the chart, you won't notice any difference in performance with different gaps. Stay in the .040 to .060 range and you'll be ok.

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    Quote Originally Posted by Knight View Post
    .055 is what I use.
    Didn't GM, a few years ago, come out with a revised recommended gap for LS1 engines? As I recall it tightened to gap up.
    Last edited by SSnow; 03-06-2011 at 06:45 AM.

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
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    The LS1 originally came with platinum plugs gapped at .060"
    The replacement plug listed in the GM parts catolog is Iridium tipped and its recommended gap is .040".
    The recommended gap for the NGK TR55s is .050" to ".060"

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    Grand Imperial Wizard Sarge's Avatar
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    Do not forget your dielectric grease and anti sieze.
    Gap those 55's at .050-.055 and go like hell.

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    Electrical Engineer KMdef9's Avatar
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    Quote Originally Posted by Sarge View Post
    Do not forget your dielectric grease and anti sieze.
    Gap those 55's at .050-.055 and go like hell.
    I grease both ends of the wires as well.

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