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Champion indicates the heat range in the middle of the plug number. For example, RV15YC6 has a heat range of 15. (The 6 at the end of this part indicates the gap setting.) Champion plugs are hotter the higher the number, colder the lower the number.
Starting with part # RCJ7Y (heat range 7), a colder plug would be # RCJ6Y (heat range 6), a hotter plug would be # RCJ8Y (heat range 8).
Once you have decided on a number, test to see if it exists by typing it into the search box. If it exists, you can add the part to your cart. For additional assistance contact our tech team at 888-800-9629.