Nickel yttrium alloy used on the ground electrode dissipates heat much better than competitor materials, resulting in lower temperatures of the ground electrode and longer run times. Extra material in thread area helps control shell deformation under torque while specially engineered crush washer offers high torque retention. Nickel plated threads reduce likelihood of seizing. Longer graphite-metal glass resistor provides consistent resistive value for EIS equipped engines. Gas tight seal prevents blow-by of combustion gasses. Full length threaded and crimped brass terminal nut provides maximum strength and secure vibration free connection to ignition leads.