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NGK Spark Plug Numbering Systems

Wondering what the numbers and letters on an NGK spark plug mean? These NGK spark plug charts explain how NGK's numbering system works.

NGK Spark Plug Numbering Chart

View full size version of NGK spark plug numbering chart.

 

NGK Performance Plug Numbering Chart

View full size version of NGK performance plug numbering chart.

 

NGK Premium Plug Numbering Chart

View full size version of NGK premium plug numbering chart.