the only difference between the 55 and 60 is the jets .060 for the 60 and .058 for the 55 ,also the 60 runs 4* more timing then the 55.
considering most guys with the 60hp fit the .058 jets and most guys with the 55hp bump the timing up to 24*.they may as well be the same.
I dunno about the seapro motors having more stainless???all the part numbers are the same
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