Clamshells on i/o's. My Moesly 21 has clam shells on the transom cap and a blower. The bilge is accessible via the anchor well and the bilge is also accessible via the motor well and a storage forward of thw fuel tank. The Seafaris also had clamshell vents and blower. The Scampi 15 and presumably the i/o bowriders did, too. My Seafari outboard has 3" holes where vent hose connects the clamshells into the bilge the aft end of the rod storage compartments. Quite an air draw with venturi-like capability when under way. Kind of clever, and likely provided a vacuum effect similar to the through-hull scuppers on the 20s.
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