Replaced factory spark plugs on Chevrolet Silverado 2008 (5.3L). They work perfectly and the car runs like new. DO NOT CHANGE THE SPACING ON THIS PLUG. Other reviewers have noted this, but it's worth repeating. They come from the factory correctly spaced for these plugs, although it doesn't hurt to double-check. All mine have been adjusted to manufacturer specs, I haven't altered them at all and they work great.
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