What is the structure of the cylinder head?

The cylinder head is a box-shaped part with complex structure. It is processed with inlet and exhaust valve seat holes, valve guide holes, spark plug mounting holes (gasoline engines) or injector mounting holes (diesel engines). A water jacket, an inlet and exhaust passage and a combustion chamber or part of a combustion chamber are also cast in the cylinder head. If the camshaft is mounted on the cylinder head, the cylinder head is also machined with a CAM bearing hole or a CAM bearing seat and its lubricating oil passage.