How do you skim a cylinder head?

Skimming a cylinder head involves machining the surface to create a flat, smooth finish, which can improve sealing and performance. First, remove the cylinder head from the engine and clean it thoroughly. Then, use a milling machine or a specialized cylinder head resurfacing tool to remove a precise amount of material from the head's surface, checking for flatness with a straightedge or feeler gauge. After skimming, ensure all surfaces are clean before reinstalling the head with new gaskets.