Copper; Copper Resistor Spark Plug
Guaranteed to deliver quick starts, good fuel economy and smooth acceleration. The copper core increases the rate of heat conduction in the spark plug tip and improves resistance to all types of fouling.
** please note the plugs now come silver not black anymore**
SOLD INDIVIDUALLY
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
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