50s Johnson sparkplug?

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  • August 26, 2017 at 3:16 am #63808
    garry-in-michigan
    Participant

      When they went from sand cast iron to die cast aluminum cylinders, a lot of stripped spark plug holes were reported. There answer was the make the head thicker and use the longer reach plugs on some models. . . 😉

      August 26, 2017 at 2:59 pm #63824
      jeff-register
      Participant

        US Member

        Your going to burn or hammer pistons. Dan has it 100% best method yet 😉

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