The valve seat is the part of your engine block that makes contact with the valve face on the valve. It needs to be cut with a valve seat cutter. A valve seat cutter is also an expensive tool but not as expensive as a valve grinder.
They are heavy. In most applications today their power to weight ratio is not considered impressive. But when they power 4 wheeled machines such as Lawn and Garden Tractors, Skidsteers, and Road Grading Machines, you want that weight to aid in delivering that power to the ground.
D-42 - Engine Wiring Diagram Specialist
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