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Old 28 Mar 2005, 05:34 pm
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Default Plug Gap

I'm bringing plugs to spec to handle my Stage 1. Have seen both .40 and .42 cited as gap recommendations. Magnecors are on. Which is correct gap??

Thanks, Bob
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Old 28 Mar 2005, 06:39 pm
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Bob,

Do you really have a tool that will tell you that your gap is either .040in or .042in ? If you do, split the difference and gap it at .041in....your engine won't know the difference.

Most tools have a setting for exactly .040in and that seems to be the consensus of what most of the Turbo PT's are being gapped at. There was a TBS for the Non-Turbo to set them at .045in
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Old 29 Mar 2005, 12:53 am
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It appears to be a personal preference--somewhere between .040 to .045, with most using .040 or .042 gap.
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Old 29 Mar 2005, 02:06 am
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I agree. I had my plugs at .045 and then regapped them to .040 and it made a difference for sure!
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Old 29 Mar 2005, 08:36 am
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I'd go with 0.040". From what I've read, gap tends to widen over time (atlthough mine didn't after 50,000 miles).
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Old 29 Mar 2005, 01:46 pm
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Thanks for the input. Will go with .40
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Old 29 Mar 2005, 08:49 pm
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My NGK Iridiums dont seem to care what gap you use and the idle so smoothe!![8)]
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Old 30 Mar 2005, 07:03 pm
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and I think that they tell you not to mess with the gap...
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Old 01 Apr 2005, 10:43 pm
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I've tried several times to go below .050. My GT doesn't like it. [:0]Always stumbles. [:I] Yes, I have aftermarket wires
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