NGK Spark Plug Stock # 7316

The NGK Spark Plug Stock # 7316, also known as the NGK TR55-1IX Iridium IX, is a premium ignition component designed for drivers and technicians who demand reliable, consistent spark performance across a wide operating range. Whether you're rebuilding an engine, performing routine maintenance, or tuning a modified vehicle, this spark plug delivers the dependable firing characteristics that separate a well-running engine from one that misfires under load. NGK's reputation in the aftermarket stems from decades of OEM supply and proven durability in both stock and high-performance applications.

The Iridium IX construction uses iridium alloy on both the center and ground electrodes, which significantly extends service life and improves ignitability compared to conventional nickel plugs. This advanced electrode design produces a finer, more consistent spark kernel that ignites the air-fuel mixture more reliably, particularly important when dealing with lean burn conditions or aggressive ignition timing. The compact 0.85-inch diameter design allows straightforward installation in standard spark plug sockets, while the 3.4-inch length accommodates most conventional engine bays without requiring extensions or adapters.

Mechanics and DIY enthusiasts benefit most from NGK Iridium IX plugs when replacing worn originals or upgrading from lower-grade options during major engine work. The TR55-1IX specification fits a broad range of automotive applications, making it a go-to choice for shops stocking universal replacement inventory. Always verify your specific vehicle's gap requirements and heat range in the owner's manual or service documentation before installation; proper gap setting ensures maximum performance and longevity. A set of four or eight plugs (depending on engine cylinder count) typically completes a routine tune-up and can be installed in minutes with basic hand tools.