Reply To: Swap 1958 Evinrude 18 HP powerhead onto 1956 Johnson 15 HP exhaust housing

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February 14, 2025 at 7:38 pm #294139
olcah
Participant

    US Member

    Olypopper,

    Both motors can use base gasket 304588.    That’s good, but possibly connections may still not line up.

    Opposed twin –  I wonder what the motor and exhaust duct years are.

    Thank you both.  I am hoping to hear from someone who has tried this swap.   I know to use the Johnson hood would require changing the 18HP Evinrude head to an 18HP Johnson one.