Genuine OEM Volkswagen Cylinder Head, part number 03C103264DX. This cylinder head is a critical component of the engine, forming the top seal of the combustion chambers and housing the intake and exhaust valves. It is marked as number 1 in the diagram. The cylinder head is precisely machined to ensure proper sealing and efficient combustion. Genuine OEM cylinder heads are manufactured to exact tolerances, guaranteeing correct valve seating, port flow, and overall engine performance and longevity.