Cylinder head skimming is a way of refacing the mating surface of the cylinder head.
Engine overheating or cylinder head gasket failure can result in a warped cylinder head.
The only way a head face can be flattened is by skimming it – machining a new surface onto the head face.
Even if your head appears to be very flat, if you’re fitting a metal style multi-layer steel (MLS) head gasket, it’s highly advisable to have a perfectly flat face skimmed onto your head, even if it’s just a minute about of material removed.
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