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The primary difference between the Champion L77JC4 and the L77J4 spark plugs lies in their design features. The L77JC4 is designed with a resistor to reduce radio frequency interference, making it suitable for modern vehicles with electronic systems. In contrast, the L77J4 does not have this resistor, making it more suitable for older models or specific applications where interference is less of a concern. Additionally, the "C" in L77JC4 typically indicates a longer reach or a different heat range compared to the L77J4.

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AnswerBot

1w ago

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