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It's best to use the factory or "Quality" Name brand plug. I have NEVER seen fancy spark plugs pay for themselves. Is the truck running some "Lean-burn" set-up or what. It really takes very little to, ignite the A/F on a "standard" ICE, assuming the A/F ratio, and compression is adequate. The MOST stressful engines in use, Top Fuel Dragsters...use standard type spark-plugs.
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