Cylinder head skimming is a process used to resurface the cylinder head of an engine. This process is typically performed when the cylinder head has become worn or damaged and is no longer providing a proper seal between the engine and the cylinder head. Skimming the head can help to improve engine performance and reduce emissions.

The process of cylinder head skimming involves using a specialized machine to remove a small amount of material from the surface of the cylinder head. This is done by passing the head under a rotating cutter that removes the surface material. The cylinder head is then inspected to ensure it is at the correct thickness and that the surface is flat and smooth.

Cylinder head skimming is a precise process that requires skilled technicians to ensure that the head is resurfaced to the correct specification. It can also involve additional steps like pressure testing, crack detection and repair, and resurfacing the valves seats.