'77 & '79 Lower Units

kajnjim

Petty Officer 3rd Class
Joined
Jun 18, 2005
Messages
87
Can 1977 and 1979 25hp Johnson lower units be interchanged? They look awful similar to me, but many parts say "1978 and newer", seeming to indicate that there may be something that changed in 1978. I'm needing to replace the foot, not the entire lower unit housing.

The model I have is 25R77S electric start. Thanks.
 
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