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What is the difference (besides price) between Brisk LR14ZC and Brisk LR14ZC-1 spark plugs?

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According to the Brisk website, the difference in the two is the gap of the spark plug. The "-1" extension, says it should be gapped between 1.0 and 1.1 mm. Without the extension, the gap should be .4 to .9 mm.

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