Reply To: 1956 Johnson 15HP Rod bearing clearance

[frankr]

Did I hear my name mentioned? The 1957 was 18hp, bigger pistons, longer wrist pins, etc. So I don’t know about compatibility with the 15hp. But what you might want to explore is the Gale 15hp versions of 1960’ish vintage. They do have roller bearing wrist pin ends. What else is common would take some research.