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The photo on the left demonstrates what happens when a projected-nose spark plug runs a little lean on a mild nitrous system. Excessive heat melts the long ground strap along with part of the center electrode and insulator. In the center is the same plug from one of the middle cylinders that did not run lean. For this application, we suggest using Autolite’s racing plug AR3933 or AR3932, which is a colder, nonprojected nose plug that will survive the nitrous environment (right).