1.Copper cored center electrode, iridium tip Ground electrode with platinum tip 2.engine spark plug lowers the required voltage Powertek Type Q5RTCThread M14x1.25Reach 17.5 mmHex 16 mmSeat Type ConicalGap 1.1 mmHeat Range (IMEP) 5Electrode Type J TypeResistor or Non-Resistor ResistorElectrode Enhancements Copper cored electrodeReference type: NGK TR5,TR5-1,TR55 DENSO T20EPR-U, T20EPR-U,T20EPR- ...