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spark plug gaps???

This is a discussion on spark plug gaps??? within the External Engine forums, part of the LSx Technical Help Section category; ok well i just installed at set of 243 heads on my 01 SS, and the stock gap is supposed ...

  1. #1
    Member foxman92's Avatar
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    spark plug gaps???

    ok well i just installed at set of 243 heads on my 01 SS, and the stock gap is supposed to be 0.60 for the 241's.. so my ? is what should the gap be for the new heads? any help would be great thanks

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    Member DaddySS's Avatar
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    The gap is the same. You only need to start modifying the gap if you are making significant HP or compression differences. As a rule for every 50HP you add you should reduce the gap .004. and for every 100 HP you may consider 1 step colder plugs. That said, many builders say they use the TR55s even with major modifications.

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    so, what would be the proper gap if your using the tr55 and your making 100hp at the crank with heads and cam?

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    Slow'er'Ass Mr. Luos's Avatar
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    I would gap TR55's at .052"

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    Senior Member JoshuaGrooms83's Avatar
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    So what about stock ls1 heads with TR5xi's?

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    Yeah baby! Yeah! silverWS6's Avatar
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    Quote Originally Posted by JoshuaGrooms83 View Post
    So what about stock ls1 heads with TR5xi's?
    .054?

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    Senior Member JoshuaGrooms83's Avatar
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    is that an answer or a guess lol but serioulsly, ive been looking up gaps so i can put my new plugs in at the right gap. I hear .060, .054, .040, and on and on and on. whats the best setting? I dont have force induction, or a cam or new heads. Just basic bolt ons and thats it. I will get a tune soon but other than that, everything is stock internally

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    Yeah baby! Yeah! silverWS6's Avatar
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    I put mine at 54 and i told my friend to put hers at 54 on her z28, we are both stock on heads and cam and that gap has worked good for me and her but then again we are running tr55 soooo i don't know about your plugs but i'm assuming it'll be the same

  9. #9
    Senior Member JoshuaGrooms83's Avatar
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    the tr5xi's are the irdium tiped NGK's. I guess ill go with .054 unless anyone has objection?

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    Senior Member JoshuaGrooms83's Avatar
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    looks like had had to gap them at .045 cause thats all i had at home and i was kinda stuck with a car with out plugs in.So far nothing out of the ordinary. If anyone thinks other wise or think i should go back in there and regap to somthing larger, please let me know. Cars runnning fine for now though

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