The Autolite Racing Plug is engineered for high-performance engines, featuring a 14 mm thread, 0.708 inches reach, and a tapered seat. Designed without a resistor, this spark plug delivers precision ignitions and optimal power for racing applications. Its compact dimensions (Length: 3.55 in, Width: 1.1 in, Height: 1.0 in) ensure an ideal fit for various racing setups.