Strange design on marine spark plug face

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  • September 1, 2024 at 11:49 pm #290363
    Beno
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      I pulled some plugs out of the top two cylinders of a 4cyl and the plug face both have this strangle oil pattern look to them:

      Swe attached pic.  Sort of an hourglass shape IMG_20240825_1235402

      Anyone know what this might mean?

       

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