Autolite - Spark Plug 3923/4 Copper4-3923 -

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Spark Plug 3923/4 CopperFeatures: Copper-glass seal bonds insulator, terminal post center electrode together; assures full required voltage at spark gap; gas-tight seal (100% leak proof) Multi-rib insulator reduces danger 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 Verify all cross reference listings before purchase Autolite - Spark Plug 3923/4 Copper4-3923 - Show more