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We've done extensive testing on every brand and type of spark plug we can fit into our cylinder heads. Boiled down, two main findings stand out. First, colder spark plugs do seem to help control Knock Retard. And second, cut back ground electrodes help to produce a few more horsepower.
All the platinum, gold, iridium and other expensive metals make no measurable difference on the dyno or at the race track.
Scott
All the platinum, gold, iridium and other expensive metals make no measurable difference on the dyno or at the race track.
Scott