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

gapping spec on NGK TR-6 plugs...

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Old Oct 25, 2008 | 07:30 PM
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Default gapping spec on NGK TR-6 plugs...
i got the NGK TR-6 plugs (due to the 10% ethanol that we are tormented with down here) due to their tech. service bulliten advising a for going down a heat range for E10.

i have read that the gap is .040" for the stock heat range, but would being one heat range cooler effect the gap?
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Old Oct 25, 2008 | 08:27 PM
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now looking through my haynes manual, it says .050" gap...

which way should i go?
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Old Oct 26, 2008 | 12:51 AM
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The .050" gap is for the stock plugs the tr6s gap around .035 and .038". You can check the nitrous section thats what is listed at there! They are colder plugs which you can gap them less for better spark from what I understand!
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Old Oct 26, 2008 | 07:47 AM
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thanks for the info, i will check out the nitrous section as well
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Old Oct 26, 2008 | 07:53 AM
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My TR-6's are gapped at .035".
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Old Oct 26, 2008 | 08:00 AM
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since i am not spraying quite yet, i will see how they feel at .038 and go from there.

i should be putting them in in the next hour or so.
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Old Oct 26, 2008 | 09:30 AM
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Mine stock were .035" and that's the way I kept it. I run N2O, but still work great without N2O
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