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Compare the model and serial number on the Welch plug ( a quarter-size shiney silver disc pressed into the side of the engine block) with the info on the ID plate by the transom clamps. If it doesn’t match, the powerhead or clamps/ID plate have been swapped. This doesn’t mean it’s bad – but if they don’t match, be sure the model is the same or ID it so you know what you are getting that’s different. I’ve run across a few that don’t match – some good, some bad. You can see the welch plug on the side of the cylinders in the photos posted above. I have a 1960 5-1/2 Johnson that has a 1957 Evinrude powerhead – whoever did this probably didn’t get the cooling changes right because it’s seized up – it was a free parts motor to me so I don’t care.
Dave