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The Sunnen VGS-20 is representative of a state-of-the-art cylinder head machine, more commonly known as a "head shop". This equipment is used to do valve seat and guide work. The valves themselves are resurfaced on a valve grinding machine which is a separate piece of equipment.
Machine Shop Basics - The Cylinder Head

 The Sunnen VGS-20 is representative of a state-of-the-art cylinder head machine, more commonly known as a "head shop". This equipment is used to do valve seat and guide work. The valves themselves are resurfaced on a valve grinding machine which is a separate piece of equipment.  View Related Article

 

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