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spark plug gap?

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Old 09-05-2009, 11:22 PM
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Default spark plug gap?
i'm about to buy some spark plugs. what should i gap them to? originally i read that the gap was suppose to be @ .060

just a little while ago i read that gm later recommended the gap to be @ .040?
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Old 09-06-2009, 12:00 AM
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I just replaced mine not to long ago and gapped at .060 runs like a champ.
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Old 09-06-2009, 12:35 AM
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i got nkg tr55s and i just stuck em in there without changing the gap
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Old 09-06-2009, 07:47 AM
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The .060 gap for NGK or any platinums has not changed - the gap for the new AC Delco or any iridiums is .040.
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Old 09-06-2009, 11:02 AM
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so if i got some iridiums i should leave the gap at .040?
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Old 09-06-2009, 04:41 PM
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a part search on NGK's site, and the part stores has changed from TR55's at .060, to TR5's at .040. i do not know the reason for this.
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Old 09-06-2009, 06:43 PM
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I just finished changing mine to TR55s and gapped them to .055 started right up and no problems driving.
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Old 09-07-2009, 10:54 AM
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from what i know the tr55's and the tr5's are the same plug just different gaps out of the box.
tr55's are set around .55 and the tr5's are set at .40
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Old 09-07-2009, 11:28 AM
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I think the TR55's come gapped at .050. I change it to .055 and it runs fine.
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Old 09-07-2009, 01:57 PM
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I use the NGK recommended .040 gap with my TR55's
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