NGK Spark Plug Stock # 5477

The NGK Spark Plug Stock # 5477 is a premium iridium spark plug designed for reliable engine ignition in a variety of automotive applications. It is an excellent choice for vehicle owners and mechanics who prioritize dependable combustion performance and efficiency. This spark plug is engineered to deliver consistent firing characteristics that are crucial for optimal engine function and emissions control.

Built with NGK's proprietary laser iridium electrode technology, the KR8AI features a 12 mm thread diameter and a reach of 0.749 inches, ensuring a precise fit in compatible engine heads. The gasket seat design promotes a secure, leak-free installation that maintains proper compression and prevents exhaust bypass. The iridium construction enhances durability and extends service life compared to traditional copper or nickel alloys, allowing for longer intervals between replacements.

This resistor-type spark plug is ideal for standard gasoline engines that require OEM-equivalent or aftermarket ignition upgrades. Vehicle owners performing scheduled maintenance, automotive technicians, and restoration specialists will appreciate its proven reliability and consistent thermal range. Installation is straightforward, requiring basic mechanical skills to ensure compatibility with your engine's specifications.