Brisk 3VR12S 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 12, resistor, with a silver center electrode for superior heat transfer and ignition in high-performance Ford 3V V8 engines with superchargers, turbos, or nitrous. Designed for enhanced combustion and durability in racing conditions. Recommended torque: 15-22 ft-lbs. Gap: 0.020-0.035 inches. Sold as each.