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Installed a set of SP534's from Stage 3. Gapped to .030. Old plugs looked pretty good for 25k miles. They were gapped between .035-.038.
 

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Installed a set of SP534's from Stage 3. Gapped to .030. Old plugs looked pretty good for 25k miles. They were gapped between .035-.038.
so how does she run with the plugs gapped at 30
 

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Throttle is just a little peppier. I never had any stumble or rough idle with other plugs.
 

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Now that Spring has finally arrived where I live, I finally got a chance to check out my plugs (along with a good "detailing" under the hood).

I only have 6,000 miles on my truck but the plugs look great ... nice light tan. I checked my gap and all were around .034. I did close them up to slighly under .030. The truck was running good before ... but I wasn't that far off.

She does like the tighter gap. And she rewarded me with a nice burn out when I stomped on it while rolling 20 mph. Even the wife bitched at me for that one.
 
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