Reply To: mid 50’s evinrude, powerhead swapability between 25-30-35 engines

[Doug]

I working on buying a 14′ 50’s era aluminum runabout that really appeals to me to hopefully attend some AOMCI events with cruises and have also found a pretty darn nice original 54 25hp evinrude to mate with it. I wanted a 30/35 but this engine was so nice I had to buy it, it will be plenty if not compatible either way and also too nice to be swapping parts for that matter, mostly curious about the interchangeability of parts in these engines through the 50’s generations. Like I said I saw an original publication with the 3 sizes listed as so similar they called out the bore and stroke for the 25,30,35 for comparison. I am not even positive of the year of that chart. I am still trying to learn more about this larger family and size range. I have had my 5.5’s for over 25 years but none larger.

I got a few I have had a long time but can always use a few more going into retirement.