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Spark Plug gapping? how much?

This is a discussion on Spark Plug gapping? how much? within the External Engine forums, part of the LSx Technical Help Section category; ive got some NGK TR-55 plugs and the gapping isnt the same on all. SO...what should the gapping be for ...

  1. #1
    Member tav8ws6's Avatar
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    Sunset Orange Metallic-M6
    2002 Pontiac Trans Am WS6

    Spark Plug gapping? how much?

    ive got some NGK TR-55 plugs and the gapping isnt the same on all. SO...what should the gapping be for all 8?

    thanks

  2. #2
    Member 89LX's Avatar
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    Navy
    2000 Z28 M6

    0.060 in

    Manual states 1.524mm (0.060 in). I set my Tr55's to 0.580 as I like them a bit tighter to start off with. Tighten plugs to 11 lb ft/15 N.m torque.
    2000 Z28 M6, SLP Lid, SLP Bellows, SLP UD,
    P&P Maf, TB By-Pass, PS Shorties, LS6 Intake, FAST 78mm TB, Hooker CB, Hurst Billet, Front Tower Brace, small 218/218....527/527....114 cam.
    337rwhp/348rwtq

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    Junior Member
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    N/A
    99 Z28

    also depends on you're mods.

  4. #4
    Member tav8ws6's Avatar
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    Sunset Orange Metallic-M6
    2002 Pontiac Trans Am WS6

    ive got long tube headers, 3 inch y pipe with high flow cats, magnaflow cat back, underdrive pulley, 160F thermostat, slp lid, k&n filter, and a dyno tune. Its a 2002 WS6 A4.

    and if anyone can help me on this... im getting 20% more fuel into the drivers cylinders for some reason. has anyone ever had something like this and how did they fix it?

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