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Spark Plug Gap

This is a discussion on Spark Plug Gap within the External Engine forums, part of the LSx Technical Help Section category; I'm in the middle of installing long tube headers I have both of them on. What is the proper gap ...

  1. #1
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    Spark Plug Gap

    I'm in the middle of installing long tube headers I have both of them on.

    What is the proper gap for the Spark plugs I have ngk v power?

    Also I'm having trouble getting the new motor mount on for the passenger side. I put new poly motor mounts in. the bolt wont go threw the passenger side. I have the new one installed on the driver side. Any suggestions on what to do. I tried jacking the motor up. Using a pry bar to move it over. ANd messed with the trans mount but still no luck.

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    Moderator Cutlass's Avatar
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    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.

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    Senior Member rajiv1998's Avatar
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    Stock LS1 heat gap is .50
    Why didnt you get pre gapped ones?
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    The spark plugs are pre gap at 0.4 from the auto part store and I double checked them, but I've heard different opinion about the gap and wanted to get opinions on it.

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    Senior Member rajiv1998's Avatar
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    Moderator Cutlass's Avatar
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    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.

  7. #7
    Member DaddySS's Avatar
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    The stock gap is .060 but NGK specifically says not to open or close the gap more than .008 from the preset so if they came gapped at .040 I would set them to .050

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