Oh, Great Repository of Automotive Minutia:
Share you wisdom, please, concerning the following:
Does anyone know the system for deciphering Champion spark plug codes?
'Frinstance, what is the difference between a "RN9YC" and a "RC9YC" plug?
And why do my "C61YC" plugs have no "R"? Resistor?
And what does the number represent? "9" and "61" are not even in the same
neighborhood. (I realize these are not for the same application, I'm just
gettin curiouser).
JohnD
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