An internal combustion engine, comprising: an engine block; a cylinder head mounted to the engine block to form at least one combustion chamber, the cylinder head defining a first and a second intake port, and a first and a second exhaust port; a first intake valve mounted to the cylinder head and arranged at least partially within the first intake port, the first intake valve being movable between an opened position and a closed position to selectively open and close the first intake port, respectively; a first exhaust valve mounted to the cylinder head and arranged at least partially within the first exhaust port, the first exhaust valve being movable between an opened position and a closed position to selectively open and close the first exhaust port, respectively; a second intake valve mounted to the cylinder head and arranged at least partially within the second intake port, the second intake valve being movable between an opened position and a closed position to selectively open and close intake the second port, respectively; and a second exhaust valve mounted to the cylinder head and arranged at least partially within the second exhaust port, the second exhaust valve being movable between an opened position and a closed position to selectively open and close the exhaust second port, respectively; characterized by: a first rotating cam mechanically coupled to the first intake valve, the first rotating cam exclusively actuating the first intake valve between the open and closed positions; a second rotating cam mechanically coupled to the first exhaust valve, the second rotating cam exclusively actuating the first exhaust valve between the open and closed positions; a first hydraulic valve actuator coupled to the second intake valve to selectively and exclusively actuate the second intake valve between the open and closed positions; and a second hydraulic valve actuator coupled to the second exhaust valve to selectively and exclusively actuate the second exhaust valve between the open and closed positions. an engine block; a cylinder head mounted to the engine block to form at least one combustion chamber, the cylinder head defining a first and a second intake port, and a first and a second exhaust port; a first intake valve mounted to the cylinder head and arranged at least partially within the first intake port, the first intake valve being movable between an opened position and a closed position to selectively open and close the first intake port, respectively; a first exhaust valve mounted to the cylinder head and arranged at least partially within the first exhaust port, the first exhaust valve being movable between an opened position and a closed position to selectively open and close the first exhaust port, respectively; a second intake valve mounted to the cylinder head and arranged at least partially within the second intake port, the second intake valve being movable between an opened position and a closed position to selectively open and close intake the second port, respectively; and a second exhaust valve mounted to the cylinder head and arranged at least partially within the second exhaust port, the second exhaust valve being movable between an opened position and a closed position to selectively open and close the exhaust second port, respectively; characterized by: a first rotating cam mechanically coupled to the first intake valve, the first rotating cam exclusively actuating the first intake valve between the open and closed positions; a second rotating cam mechanically coupled to the first exhaust valve, the second rotating cam exclusively actuating the first exhaust valve between the open and closed positions; a first hydraulic valve actuator coupled to the second intake valve to selectively and exclusively actuate the second intake valve between the open and closed positions; and a second hydraulic valve actuator coupled to the second exhaust valve to selectively and exclusively actuate the second exhaust valve between the open and closed positions. a first rotating cam mechanically coupled to the first intake valve, the first rotating cam exclusively actuating the first intake valve between the open and closed positions; a second rotating cam mechanically coupled to the first exhaust valve, the second rotating cam exclusively actuating the first exhaust valve between the open and closed positions; a first hydraulic valve actuator coupled to the second intake valve to selectively and exclusively actuate the second intake valve between the open and closed positions; and a second hydraulic valve actuator coupled to the second exhaust valve to selectively and exclusively actuate the second exhaust valve between the open and closed positions.