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Where are my boat motor drain plugs. In this video I show you where your 4.3 , 5.0, and 5.7 Mercruiser drain plugs are. The boat block has two drain plugs and the each manifold has a drain plug. There is also a drain plug below the motor water pump. You should always drain the block to winterize the boat and then add Marine coolant to prevent the ice from bursting you motor.