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Cylinder Heads

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Even though it's common for the valve seat to have two angles ground into it, the valve usually has just one angle. Thus, the three-angle valve job. A grinder with a stream of cutting lubricant or coolant, imparts the proper shape on the valve.
Machine Shop Basics - The Cylinder Head

 Even though it's common for the valve seat to have two angles ground into it, the valve usually has just one angle. Thus, the three-angle valve job. A grinder with a stream of cutting lubricant or coolant, imparts the proper shape on the valve.  View Related Article

 

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