AUTOLITE AUTOLITE SPARK PLUG 4163/4 COPPER 4163 PART NUMBER 4163

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• Copper-glass seal bonds insulator, terminal post center electrove together; assures full required voltage at spark gap; gas-tight seal (100% leak proof)
• Multi-rib insulator reduces dange of "flash-over"
• One-piece terminal post adds strength
• Resistor reduces radio frequency interference (RFI) and electrode erosion
• Cold-formed steel shell precision rolled threads
• Full copper core electrode provides better performance in all conditions