Re: Identifying a Johnson 5.5(?) powerhead

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June 22, 2016 at 12:38 pm #38748
Don
Participant

    US Member

    Well, the biggest change was sometime in those years needle bearings were added to the rods. Sounds like your powerhead is somewhere between a 1959 and 1964, don’t know why someone would have added a 66 ID core plug.