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1500logo.jpg (8159 bytes)Spark Plug heat range and
      manufacture cross reference

Heat range           Champion                 NGK                  Bosch
Hot N12YC
N11YC BP5ES W8DC
N9YC BP6ES W7DC
N9YC W6DC
N7YC BP7ES W5DC
Cold N6YC BP8ES

Notes:
1)  An 'R' in the number for champion is the designator for 
resistive type plugs to help supress RF emmisions
2)  NGK no longer uses these numbers, but most 'parts stores' still have cross references to these numbers to NGK's new number system

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