Box of 4 Genuine Autolite 306 Copper Resistor Spark Plugs

Brand New Box of 4 Genuine Autolite Spark Plugs…· Brand New Box of 4 Autolite Spark Plugs· Genuine Autolite Part # 306 Copper-glass seal bonded insulator, terminal post, and center electrode provide a tight seal that is 100 percent leak-proof Multi-rib insulator reduces danger of "flash-over" to prevent misfires Full copper core electrode improves heat transfer and optimizes plug life Copper core center electrode provides higher thermal conductivity Features high alumina ceramic for high dielectric strength and steel shell for installation robustness