Spark plug numbers and letters. We break down how to decode the part number and stock number on your NGK spark plugs. View full size version of NGK premium plug numbering chart. Numbers after the prefix indicate the type of spark plug and also the specific application:. View full size version of NGK performance plug numbering chart. This comprehensive guide unravels the mystery behind NGK spark plug numbers, empowering enthusiasts and professionals alike to make informed decisions. Wondering what the numbers and letters on an NGK spark plug mean? These NGK spark plug charts explain how NGK's numbering system works. com Sep 6, 2024 · Understanding how to read spark plug numbers is essential for diagnosing engine performance issues and ensuring optimal operation. This guide will provide a comprehensive overview of spark plug numbers and their significance. View full size version of NGK spark plug numbering chart. See full list on rxmechanic. May 12, 2025 · Yet, deciphering the seemingly cryptic alphanumeric codes stamped on spark plugs, particularly those from NGK, can feel like cracking a secret code. Mar 26, 2025 · But have you ever stopped to wonder about the cryptic letters and numbers etched onto the side of a spark plug? These markings are not random; they hold a wealth of information about the spark plug’s design, performance characteristics, and intended application. pac pfgg nex flgz cctsu yewblx azkwek iqmxg xxhqeh hwnrlp