NGK Spark Plug Stock # 92400

The NGK Spark Plug Stock # 92400 is a precision-engineered ignition component designed for reliable engine starting and consistent combustion across a wide range of automotive applications. As a mechanic, you'll recognize this as NGK's FR7BHX-S variant—a proven performer in both stock and lightly modified engines where dependable spark delivery is non-negotiable. Whether you're maintaining daily drivers, restoring classics, or tuning street machines, quality spark plugs are the foundation of efficient fuel burn and responsive throttle response.

NGK's construction in this plug emphasizes durable ceramic insulation and a precisely gapped center electrode that maintains consistent spark energy across the RPM band. The FR7BHX-S uses a trivalent metal plating process that resists corrosion and extends electrode life compared to standard copper-core designs, making it ideal for vehicles exposed to moisture or stored seasonally. The compact 0.1 lb design fits within standard spark plug wells, and the 1 x 0.9 x 3.45 inch dimensions ensure no interference with headers, intake manifolds, or custom engine bay layouts—a critical consideration when you're working with modified valve covers or turbo plumbing.

This NGK spark plug is compatible with a diverse range of engines, from inline-four commuters to small-displacement V6 and V8 platforms, making it an essential backup stock item for any shop or enthusiast garage. Installation is straightforward—remove the old plug, confirm the gap setting matches your engine spec (typically 0.028–0.032 inches for most applications), and torque to 15–20 foot-pounds to avoid ceramic cracking. Pair these plugs with fresh ignition wires or coil packs and you'll notice smoother idle quality, faster cold starts, and improved fuel economy on stock or mildly tuned engines.