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Spark plugs (gap size)

This is a discussion on Spark plugs (gap size) within the General Help forums, part of the LSx Technical Help Section category; If I dont have the peice to check the gap size, what could I just to check it, I just ...

  1. #1
    Senior Member Justin23454's Avatar
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    Spark plugs (gap size)

    If I dont have the peice to check the gap size, what could I just to check it, I just bought the AC Delco Iridium yesterday and wanna put them in SAt. when I do my headers, anyone know what else I can use to make sure they have the right gap?

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    Single Malt rbob93's Avatar
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    Simple.....a wire type plug gauge.....borrow one if you must.
    You paid $6 each for plugs.....you want the most out of them don't you?
    Last edited by rbob93; 12-14-2007 at 09:56 AM.

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    Senior Member Justin23454's Avatar
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    ya, what size gap should I have in it?

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    Single Malt rbob93's Avatar
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    I gap mine @.055 but I'm pretty much stock

    You'll need a tune for the headers.....you might want to ask your tuner for his recommendation

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    Moderator Firebirdjones's Avatar
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    I prefer to usea regular feeler gauge,,,can pick them up at any parts store,,,they are cheap.

    I believe stock gap is .050 but alot of people tighten that up a bit. I know I closed mine some,,,but can't remember how much off the top of my head.
    But like Bob said,,,if you use a local tuner,,,ask them what they like to see and adjust accordingly.

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    ALL RANSTRANSAM,S ranmansbaby's Avatar
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    .055 is ok but you cars plug are suppose to be gapped @ .060 and yes you can use a feeler gage but it's not going to be acurate because even on a spark plug feeler gage you only have in thousandths .025-.045

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    ALL RANSTRANSAM,S ranmansbaby's Avatar
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    i work at Napa and i see this alot

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    Single Malt rbob93's Avatar
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    Quote Originally Posted by ranmansbaby View Post
    .055 is ok but you cars plug are suppose to be gapped @ .060 and yes you can use a feeler gage but it's not going to be acurate because even on a spark plug feeler gage you only have in thousandths .025-.045
    What the hell are you talking about???

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    Moderator Firebirdjones's Avatar
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    I got lost on that post too,,,,,lol,,,,,I have used a feeler gauge for many years,,,works great,,,,with increments of .001 you can make them any size you want.

    But most tuners will tell you to tighten up that stock gap a little bit. Some go as tight as .035. It's been proven many many years ago that a wider gap does nothing for HP,,,it only makes the coils work harder.

    Also on a nitrous car,,,,blower car etc...with alot of cylinder pressure it's best to tighten the gap,,,,as high cylinder pressure will tend to blow out the flame on high cylinder pressure applications.

    If you modify the car at all,,,,with bolt ons,,,,,camshaft, heads,,etc....you can experiment with gap size,,,or better yet,,,,ask some local tuners in your area that dyno,,,build,,,and tune LS1's they may give you a better idea what they see and like to use.

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    For a header only car I would run them out of the box.

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