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  1. Jack's post in straight 6 inboard was marked as the answer   
    found this :
    Best Answer - Chosen by VotersThe 165 is a GM 250 CID inline 6 block. These haven't been produced since about 1980. The modern equivalent is the GM 4.3L V 6, used by Merc, Volvo, and OMC, the basic 2 bbl carbed model producing 175-185 hp. Too bad they changed, in my opinion the old inline 250 was the best small marine inboard engine ever made.
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