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Brand-new genuine ACDelco R42TS spark plug. This spark plug is two heat ranges colder than the original stock R44TS factory installed spark plugs.
This plug is designed to dissipate heat much faster than a stock plug in order to reduce the center electrode temperature and prevent detonation on heavily modified engines applications running under extreme boost and RPM levels.
This genuine ACDelco part will ship in its original box as pictured.
Recommended gap = 0.035"
