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Spark plug gap for Cam Only ls1??

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Old Nov 10, 2013 | 01:29 PM
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Default Spark plug gap for Cam Only ls1??
what do i gap my spark plugs to? They are NGK TR55, Msd wires, longtubes, cam, and cold air intake everything else is stock. Thanks!
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Old Nov 10, 2013 | 03:12 PM
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Originally Posted by 91ls1silverado
what do i gap my spark plugs to? They are NGK TR55, Msd wires, longtubes, cam, and cold air intake everything else is stock. Thanks!
i like .045
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Old Nov 10, 2013 | 05:08 PM
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I have the same plugs gapped to.55.
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Old Nov 11, 2013 | 12:20 AM
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I've run 45 to 60 with no issue. GM's TSB advises spark plug gap be revised and set to .035 for our cars. I've never actually tried that though.
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Old Nov 11, 2013 | 07:56 AM
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Those plugs come out of the box already gapped at .055. They will work fine at that gap. But I would always check each of them and make sure that they are all gapped properly before you install them.
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Old Nov 11, 2013 | 07:57 AM
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.035" works well for TR6. I don't know about the TR55.
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Old Nov 11, 2013 | 09:35 AM
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TR55s are gapped at 60 I thought.... TR6s are gapped at 35.

EDIT: interesting NGK recommends a TR5 gapped at 40 for our application.
Last edited by 01ssreda4; Nov 11, 2013 at 10:06 AM.
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Old Nov 12, 2013 | 04:14 AM
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Second digit in the part number is the gap. TR55 and TR5 are the same plug, different gap. I would use the TR5 myself, which has the smaller gap that meets the updated GM requirements.
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Old Nov 12, 2013 | 06:57 AM
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Originally Posted by 01ssreda4
TR55s are gapped at 60 I thought.... TR6s are gapped at 35.

EDIT: interesting NGK recommends a TR5 gapped at 40 for our application.
You are incorrect sir NGK TR55 plugs = .055 gap out of the box.
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Old Nov 14, 2013 | 01:15 AM
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Yeah my mind gets foggy about these little trivial items!
Last edited by 01ssreda4; Nov 14, 2013 at 11:24 PM.
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Old Nov 14, 2013 | 06:27 AM
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Originally Posted by 01ssreda4
Yeah my mind get foggy about these little trivial items!
Tell me about sir I'm 66 years old...when you get to that age you have numerous brain farts...LOL...
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