You should have slots on either side of the lowest part of the outdrive, above the skag or fin. There can be a difference if you have what is called a closed cooling system. The closed system has a radiator in front of the engine like an auto. The water from the lake goes through heat exchangers and does not make direct contact with the water in the radiator. The older open system uses lake water directly and it goes through the slots on the lower unit.
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You should have slots on either side of the lowest part of the outdrive, above the skag or fin. There can be a difference if you have what is called a closed cooling system. The closed system has a radiator in front of the engine like an auto. The water from the lake goes through heat exchangers and does not make direct contact with the water in the radiator. The older open system uses lake water directly and it goes through the slots on the lower unit.