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

Spark Plug Gap

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Old 06-01-2006, 10:23 AM
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Default Spark Plug Gap

I did the search already and found that factory gap is right around .050. I saw once that if I were to buy a .035 it would be better performance. If that is true, what other effects would buying a .035 gap create?
Old 06-01-2006, 12:26 PM
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Lol, decreased plug life.
Old 06-01-2006, 12:40 PM
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Originally Posted by dhdenney
Lol, decreased plug life.
I'm curious as to any noticable differences. Not that I'm going to buy them, just trying to learn..
Old 06-01-2006, 01:24 PM
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I don't think you can buy pregapped plugs other than stock gap. You can buy the cheap copper ones and gap them yourselves. Generally the closer the plug gap is for nitrous and supercharger and high compression. These applications need closer gaps to keep the fire more continuous. I think the wider the gap, nitrous/superchargers/high compression can "blow it out." For a naturally aspirated car, stock gap is best for longest life. I do not know of any positive effects of closer gap only.
Old 06-01-2006, 01:39 PM
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Good explanation, makes perfect sense. Although Thunder Racing sells the different gaps, that's why I was asking...just curious



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