Re: Johnson 20hp cyl head

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August 1, 2017 at 1:24 am #62460
frankr
Participant

    Mixing 20 and 25hp pistons and head will get you in trouble. If you have 20 pistons, you need a 20 head. Sounds like Garry has done some experimenting with them—successfully, I assume (??) What kind of compression did you wind up with, Garry?