Genuine OEM Volkswagen Cylinder Head, part number 0XW103063C. This cylinder head forms the top of the engine's combustion chamber, housing the valves, spark plugs, and injectors. It is located at position 1 in the engine block diagram. Genuine OEM cylinder heads are cast and machined to exact specifications, ensuring proper sealing, heat dissipation, and valve train alignment for optimal engine performance and longevity.