Genuine OEM Volkswagen Cylinder Head With Valves, part number 04C103063N. This is the main component of the engine's combustion chamber, housing the valves and camshafts. The cylinder head seals the top of the engine block, forming the combustion chambers where fuel and air are ignited. It contains passages for coolant and oil, as well as the intake and exhaust valves. Genuine OEM cylinder heads are precision-engineered for exact fitment and optimal engine performance.