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I have Wayne's book so everything as far as replacement is more than clear. I am just trying to see if people have had more success with certain plugs. Just like in my drag car these plugs require changed more frequently than most so it would seem logical to just use a copper plug in the appropriate heat range. Outside of longevity I have never seen a reason for the platinum or iridium plugs. I am wondering if anyone has actually seen improvement from them or not.
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