Well actually it depends on the maker of the outboard what exact year the hp changes were made wasn't across the board in a certain year. But my point was and still is that a boat hull that started with a 235 rating did so usually because OMC was making a 235hp outboard. Later in the 1980's when the hp ratings were prop rated boat hull mfrs still kept the higher hp ratings. So yes it has everything to do with the in question this particular boat a 1987 is 24 years old and what is more important is the condition of the transom and stingers. FWIW a 175 etec is probably the equivelent of the old 235 omc crossflow powerwise.
Brian
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