Reply To: Substitute for Champion J-8J spark plugs

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June 21, 2025 at 10:57 am #297510
A. Hoskins
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    A Champion J8C is basically the same as a J8J. The ‘C’ suffix stands for “copper”. The ‘J’ suffix meant that the negative electrode is cut back to expose 1/2 of the center electrode, see the picture Tubs included. Champion hasn’t sold ‘J’ suffix plugs for many years. Cutting back the negative electrode theoretically exposes more of the spark. You can do this to any plug, it’s an old hot rod trick. I think the results are mostly imaginary but you get bragging rights.

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