Genuine OEM Volkswagen Cylinder Head, part number 03C103063CB. This is the main component of the engine where combustion takes place, housing the valves, camshafts, and spark plug (or injector) ports. It forms the top seal of the engine block. This assembly includes the valves, ensuring a complete unit ready for installation. Genuine OEM parts guarantee the correct airflow, sealing, and thermal management critical for engine operation.