Re: prop for 1957 johnson 3 hp
These motors appeared in 52 using 6 1/2 X 5 3/4 prop in 56 changed to 6 1/8 X 6 1/4 prop.Motor specs are the same 52- 68 using the 6 1/8 X 6 1/4 prop. from 56 Can't tell you if mounting is the same nor if straight and angle is the same mount, pitch is the same.Yatchtwin is a different pitch. ebay or aomci.org would be a good source.
