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spark plug gap

This is a discussion on spark plug gap within the General Help forums, part of the LSx Technical Help Section category; hey guys i was hoping if somebody can help me.. the thing is like i said on my other post ...

  1. #1
    Member dav-02ws6-m6's Avatar
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    2002 trans am ws6

    spark plug gap

    hey guys i was hoping if somebody can help me.. the thing is like i said on my other post that i was going to do the tune-up on my car. well i finally started today BUT i was getting ready to start on the spark plugs when realize that i didn't know the the spark plug gap... the car has boush 4 tip spark plug and i am going for NGK iridium IX ( TR51X ) i dont have anything on the car right now except for the air lid. cb and maybe latter some LT headers. thank you an advance for all the help...

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    Smiles for 9.5 Years cammed goat's Avatar
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    If I remember correctly, the gap for the LS1 is .40 or .45. I could be wrong though. Others will chime in here.

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    My TR55's are gapped at .054". Not sure what to do with a platinum tip plug. Cutlass just posted some great info on plugs -- I'll find it and post the link.

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    Here it is: NGK spark plug

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    Moderator Cutlass's Avatar
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    Anywhere around .050" is pretty reasonable for our cars. There are reasons to go a little bigger gap and there are reasons to go a little smaller gap. Pick a number and go with it You can look up your plugs on NAPA's website and they'll list the recommended gap
    Plus I think the NGK's come pregapped so just check them all and make sure there all the same.
    Last edited by Cutlass; 03-24-2010 at 07:02 PM.

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    Member dav-02ws6-m6's Avatar
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    2002 trans am ws6

    thank you guys

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    Member dav-02ws6-m6's Avatar
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    2002 trans am ws6

    well i check the NGKs and they are set up on .035 so i'll just go on the 40's thanks for the help again..

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    Member blackbird0230's Avatar
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    I went with .40 on my NGK55's
    Although I think .50-.60 is recommended.

  10. #10
    Member dav-02ws6-m6's Avatar
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    yea i'm thinking i'll go from 40 to 45 sense i don't have any mods on the car.

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    Member dav-02ws6-m6's Avatar
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    2002 trans am ws6

    well guy i'am done with the spark plug. i already went and drove it an seem like they are working fine. i just hope that i don't have to do that in a while. thank for all the input and help.

  12. #12
    Smiles for 9.5 Years cammed goat's Avatar
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    Shouldn't have to. Enjoy.

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    Member Lawnboy's Avatar
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    The stock gap is big! around 55, some say 60, i run TR6IX NGK's , awasome plugs , car runs smoother with them.

    OK i run a 32-35 spark gap , Yes its tight , but i am procharged and at 15 psi, with the high cyclinders pressures a small gap keeps the spark strong, and wont blow out.

    on a NA car i would stay with a 45-50 gap for a better burn

    The bosh 2, 3 or 4 tip plugs are not a good choise in the LSX motors IMOP,

    i seen a car that was being dyno tuned and the dyno, the dyno spark plug wire pick up couldnt read the rpm of the motor, it was becuses of the 4 way bosh plugs that the customer was using, I guess it was causing a multi spark and the pick up was reading it wrong

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    Member squirlnutz's Avatar
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    Quote Originally Posted by cammed goat View Post
    If I remember correctly, the gap for the LS1 is .40 or .45. I could be wrong though. Others will chime in here.
    you are correct. .40
    Also, -.04 for every 50hp added, Naturaly asperated ONLY!

  15. #15
    Member Lawnboy's Avatar
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    the stock gap looks much wider than 40 i seen some plugs come out with 50-60

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