14631-ZVP-000 Rocker Shaft - Overview. The 14631-ZVP-000 Rocker Shaft is an essential component of Honda marine engine valve train systems. It works in tandem with rocker arms to control the opening and closing of intake and exhaust valves, ensuring the engine operates reliably and efficiently. As a genuine OEM part, it is manufactured to meet all factory specifications, dimensions, and tolerances, ensuring seamless integration with existing engine components, maintaining optimal performance and