12225-ZY3-A04ZA Cyln Head-Cam *NH8* - Overview. The 12225-ZY3-A04ZA Cyln Head-Cam *NH8* is a critical cylinder head component specifically engineered for Honda marine engine systems. This camshaft assembly supports the engine's valve timing system, ensuring precise mechanical motion and smooth operation. Designed to meet factory specifications, it provides reliable performance and durability to keep your marine engine running efficiently. Engineered for easy integration, this part fits seamlessl