Racing Plug # 4074

The NGK Racing Plug # 4074 is a premium non-resistor spark plug engineered for high-performance and racing applications where maximum spark energy and reliability are essential. Designed for enthusiasts and professional racers who demand ignition components that can withstand sustained high RPM operation, this spark plug delivers consistent firing across extreme engine conditions. The Racing Plug # 4074 is the choice for those building or maintaining race-ready engines that require superior electrical conductivity and thermal performance.

This NGK racing spark plug features a 14 mm thread size with a 0.749 inch reach and gasket seat design, ensuring proper fitment and seal in compatible engine heads. The non-resistor construction eliminates suppression circuitry, allowing unimpeded electrical discharge for enhanced spark intensity—a critical advantage in racing engines where every millisecond of combustion timing matters. NGK's manufacturing expertise ensures precise electrode geometry and ceramic insulator quality, enabling reliable ignition at maximum fuel mixture demands and high engine loads. The compact 1 x 0.85 x 3.4 inch dimensions and 0.13 lb weight make installation straightforward in tight engine bays.

Competition drivers, engine builders, and performance tuners benefit most from the Racing Plug # 4074 when optimizing ignition systems for naturally aspirated or forced-induction engines. The gasket seat design ensures proper sealing without relying on crush-seat compression, which is critical when re-gapping or servicing racing engines. Verify thread size (14 mm), reach (0.749 in), and seat type compatibility with your specific engine before purchase, as spark plug specifications vary significantly across manufacturers and engine platforms. For motorsports applications requiring consistent spark delivery under peak performance conditions, this NGK racing plug is a proven upgrade over standard resistor plugs.