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A MerCruiser sterndrive combines an inboard engine with an external drive mounted through the boat's transom. The engine stays inside the boat, while the sterndrive transfers that power through the transom and down to the propeller. If you own a MerCruiser, you'll commonly see four drive names: Alpha One, Bravo One, Bravo Two and Bravo Three. They may look similar at first glance, but they aren't interchangeable versions of the same drive. Each was designed around different power levels, propell …