Product Description
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 and racing applications running under extreme boost and RPM levels. We do not recommend this heat range for stock and mostly street driven vehicles as it will run too cool to burn off combustion deposits and may foul prematurely, causing misfires.
This genuine ACDelco part will ship in its original box as pictured.
Recommended gap = 0.035"
