Mercury - Decal Set for 4.6L V8 300HP SeaPro Outboards Cowling Restoration Kit Factory-Matched Marine Graphics 8M0214857. Overview. A SeaPro isn't the kind of engine that spends its life idling around the marina. It works - day after day, tide after tide. It pushes heavy boats, hauls gear, carries crews and handles conditions that would make lesser engines complain. But even when the powerhead keeps performing, the cowling tends to tell the story of that hard work. Sun dulls the edges. Salt find