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Re: Yet Another Spark Plug Question
I always recommend running factory plugs in your engine. Motorcraft in Ford, Champion in Mopars and Delco in GM. Lots of engineering goes into this plug. Heat range, materials etc. I agree only way a spark plug like the E3s or Splitfires will give any noticeable power gains would be in a high horsepower engines.
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07' Extcab Silverado Z71 Silver Birch, 5.3L HO
71' Cheyenne C10 Hugger Orange on Saddle SWB
Besides these two, too Many to count
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