Internal combustion boat engine components, namely, boat engine lifters, rockers,and cam lobes; systems for enhancing the performance and fuel economy and reducing the emissions of boats, namely, systems comprised of boat engine lifters, rockers, and cam lobes; desmodromology and internal supercharging systems for enhancing the performance and fuel economy and reducing the emissions of boats, namely, systems comprised of boat engine lifters, rockers, and cam lobes; retrofit systems for conver...