Brisk 3VR17YS Silver Racing spark plug for race car engines. Features a 16mm thread, 22mm (7/8in) reach, and 14mm (9/16in) hex with a tapered seat. Heat Range 17, resistor, with a silver center electrode for optimal heat transfer in Ford 3V V8 naturally aspirated racing engines. Offers improved combustion and durability for high-performance racing. Recommended torque: 15-22 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.