Thread: Spark plug correct gapping

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  1. #1 Spark plug correct gapping 
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    Ok guys picked up some fresh Autolites 104's to get my motor running and want to know what is the proper gapping for these plugs mods are as follows if that helps:

    XP Cam
    Stage 3 P&P Heads
    130# Springs
    SD Headers
    3.2 pulley



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  2. #2 Re: Spark plug correct gapping 
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    .055
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  3. #3 Re: Spark plug correct gapping 
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    I run my 103's at 35 because it was showing I was getting blowout on the dyno. I would say start around 40 to 45 and then you can tighten it up if you start to get blowout.
    98 gtp- cammed intercooled slowness
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  4. #4 Re: Spark plug correct gapping 
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    Aren't 103's to cold? Dsmuts I'm leaning to .055 but I'ma do 40 as well

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  5. #5 Re: Spark plug correct gapping 
    Moderator dsmuts's Avatar
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    104's is what I'd run. I'm running 104's @ .055 right now. I have about 15k on them right now
    98 GTP modded 1.9's, sd headers, 3.4", zzp 1.0 230K miles scrapped.
    04 Comp G zzp stb's, UMI ta's, Speedbuilt sways, bully flo heads, XP, zzp headers, fsic, thrasher shift kit, 60#, 2.6" corsa 2.5", Inferno hood
    01 gt z7 turbo tep trans zzp motor
    08 g8 gt cam exhaust 11.87@118
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  6. #6 Re: Spark plug correct gapping 
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    I run my 104's at .045.
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