"71 25hp lower unit interchange?

[Haus]

just wondering what yrs shared the same bottom end?
i know the 18,20,25 were basically the same motors, but did they share the same bottom ends? and what yrs?

thanks

 

[Haus]

Re: "71 25hp lower unit interchange?

can anyone confirm that these bottom ends are interchangable?

10 HP - 1951-1957
15 HP - 1953-1956
18 HP - 1957-1973
20 HP - 1969-1973
25 HP - 1969-1977

thanks