Brisk GOR17LGS Premium Racing spark plug for race car engines. Features a 14mm thread, 18mm (0.71in) reach, and 16mm (5/8in) hex with a tapered seat. Heat Range 17, resistor, with a surface discharge design for enhanced spark and combustion efficiency in high-performance racing engines. Ideal for high-performance naturally aspirated setups. Recommended torque: 15-22 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.