The Autolite Racing Plug AR52 is designed to meet the rigorous demands of professional racing. Its cut-back ground electrode ensures optimal ignitability and quicker starts, while the anti-corrosive nickel plating enhances durability by preventing rust. The high alumina multi-rib ceramic insulator provides superior thermal conductivity and insulation, reducing the risk of flash-over. With a 14mm thread diameter, 0.750-inch reach, and gasket seat, this non-resistor spark plug is tailored for high-performance engines. The solid terminal and projected center electrode design further contribute to its reliable performance under extreme conditions.