There is no set number for the miles-hours figure. Most direct drive engines are good for 2,000 hours if they are maintained well. There is nothing wrong with installing a good used engine. My boat was repowered prior to me getting it due to not being winterized. I have a 1000 hour boat with a 500 hour engine that purrs like a kitten at idle and roars at WOT. Going the short block route is also a fine alternative. Be sure to freshen the heads if you go this route.
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