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The new spark plug recommendation for the Atomic Four engine is the Champion #592 – spec RJ12C. What does the Champion id number code mean?

Atomic Champion engine PLUG recommendation SPARK Spec
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The new spark plug recommendation for the Atomic Four engine is the Champion #592 – spec RJ12C. What does the Champion id number code mean?

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RJ12C: “R”: fitted with a resistor to cut radio static “J”: 14 mm thread, 3/8″ thread length “12”: heat range rating (slightly hotter than the original Atomic Four plug, the RJ8C) “C”: Champion “copper plus” design

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