NGK R7437-8 4901 Spark Plug Racing R74378

The NGK R7437-8 4901 Spark Plug Racing R74378 delivers high-performance ignition for competitive engines requiring 14mm diameter plugs. Engineered for consistent spark energy, efficient heat dissipation, and robust durability, these racing plugs help maximize horsepower, throttle response, and overall combustion stability under demanding conditions. The R7437-8 series is designed to withstand aggressive tuning, high RPM, and elevated cylinder pressures, making it a reliable choice for performance builds and track use. With precise electrode geometry and premium materials, you can expect reliable starts, reduced misfires, and improved fuel efficiency across a wide range of racing applications. Ideal for sport bikes, ATV, and small performance engines seeking peak ignition performance.