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LT1-LT4 Modifications 1993-97 Gen II Small Block V8

What should I gap my spark plugs at?

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Old 04-17-2010, 03:04 PM
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Default What should I gap my spark plugs at?
I'm going to put on full exhaust hooker LT, Catted Y pipe, GMMG exhaust and it has a Moroso CAI. it will only have basic bolt on for now and I'm going to change the spark plugs and spark wires while I'm doing the headers.

They are TR55, should I gap them at .45?
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Old 04-17-2010, 03:20 PM
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My Vote is stock gap.
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Old 04-17-2010, 03:22 PM
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What is stock at, .50? I never done the spark plugs on an lt1 so I have no prior knowledge.
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Old 04-17-2010, 04:27 PM
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Stock gap is .050 I think, should say on your radiator cover though just to check.
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Old 04-18-2010, 12:02 PM
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i gapped mine at .45
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Old 04-18-2010, 12:06 PM
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IIRC stock gap is .050" so that's where I would gap them at.
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Old 04-18-2010, 12:13 PM
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Bolt-on cars should gap at. 050".
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Old 04-18-2010, 06:55 PM
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Originally Posted by RamAir95TA
Bolt-on cars should gap at. 050".
okay thanks Ram
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Old 04-18-2010, 09:20 PM
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One of my friends swear that checker told him .60 could that hurt his motor
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Old 04-18-2010, 10:33 PM
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Whoever "checker" is is NOT the GM service manual. .050".
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Old 04-18-2010, 10:43 PM
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But what could it do. Tohave a ten degree more then required
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