Just found a set of RS14YC plugs on the shelf, I know they will fit my vortec heads, but where/how can I look up the heat range for these vs. other 10YC, 12YC and the 6-suffixed plugs like RS14YC6?
the lower the number is colder.try 12.if the engine is tuned decent they wont foul.other number have to do with reach and such
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