know your spark plug codes

[thechuckster]

jusr in case you were ever wondering what those codes actually meant:

from http://www.msefi.com/

[EVOSTi]

yep thats in the front of the ngk application book, just like in the nippon denso book there is a similar thing outlining the letters and numbers.

[CrUZida]

FYI Bosch heat numbers go the opposite way.
Lower number is colder.