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On the left is a traditional-style plug with a J-strap electrode. NASCAR Sprint Cup engine builders have developed issues with the electrode falling off due to vibrations in the combustion chamber, so some plug manufacturers, like Champion, came up with the surface gap design (right) that eliminates the J-strap electrode to eliminate the problem. The surface gap plug doesn’t help produce more power so it’sn’t recommended unless you’re experiencing electrode failures. View Related Article
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