Details

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CHAMPION POWER COPPER PLUG

P-Z9HC (C6HSA) <-- Standard Heat Range
P-Z7HC (C7HSA) <-- Colder Heat Range, for those engine already modded or always high revving.

What does a colder heat range spark plug do?
A colder heat range spark plug may be necessary if the ignition timing has been advanced to near the knock level. Higher cylinder temperatures near the knock level will bring the spark plug firing end temperature closer to the pre-ignition range.

-EX5
-C70
-KRISS