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Manufacturer's Numbering Systems
Wondering what the numbers and letters on a spark plug mean? These spark plug charts explain how each manufacturer's numbering system works.
Autolite Spark Plug Numbering System
Bosch Spark Plug Numbering System
Champion Spark Plug Numbering System
Denso Spark Plug Numbering System
Denso Industrial Plug Numbering System
NGK Spark Plug Numbering System
NGK Glow Plug Numbering System
NGK Resistor Cover Numbering System