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LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Spark Plugs what do you gap your's at?

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Old Feb 6, 2007 | 08:40 AM
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2tight's Avatar
2tight
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Spark Plugs what do you gap your's at?
I have a set on NGK TR55'S what are you guy's gapping at stock ?
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Old Feb 6, 2007 | 08:56 AM
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The books says .050, Im running .035
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Old Feb 6, 2007 | 09:07 AM
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I ordered some NGK TR55's as well.. what do they come gapped at?
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Old Feb 6, 2007 | 09:15 AM
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I think the rule of thumb is close it down .010 for every 100 HP added, open it back up .005 for an added ignition system. I'm running my 350 RWHP setup at .045 and not having any issues.
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Old Feb 6, 2007 | 10:08 AM
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TR55's should come pregapped at .050; always verify the gap before installing plugs. For a stock setup, leave your gap at .050
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Old Feb 6, 2007 | 11:57 AM
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I gapped mine at what the underhood sticker recommends: .050"
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Old Feb 6, 2007 | 12:18 PM
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.050 always. But msd helps bridge the gap for me.
Last edited by oneslowz28; Feb 7, 2007 at 03:38 AM.
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Old Feb 6, 2007 | 12:50 PM
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Originally Posted by oneslowz28
.50 always. But msd helps bridge the gap for me.
I think you're missing a zero somewhere in there. Mine are gapped at 0.050, as indicated under the hood and in the owners manual.
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Old Feb 7, 2007 | 03:37 AM
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Originally Posted by MysticTeal95Z28
I think you're missing a zero somewhere in there. Mine are gapped at 0.050, as indicated under the hood and in the owners manual.
yea I missed a zero. Thats what I get for not previewing my post.
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Old Feb 7, 2007 | 03:57 PM
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Run them at .035--- it will save your opti.
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Old Feb 7, 2007 | 04:07 PM
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You can run them without the electrodes if you want to, but the recommendation is .050 for n/a application.
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Old Feb 7, 2007 | 04:10 PM
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.035" here.
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Old Feb 7, 2007 | 04:11 PM
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.050 here.
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Old Feb 7, 2007 | 04:32 PM
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.050

Make sure to look at every plug as some of my new tr55s were slightly off the .050 mark.
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Old Feb 7, 2007 | 04:36 PM
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gitsum
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Ive been running TR55s at .050 but switched to Autolite 104s gapped at .035 and picked a few MPGs.
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