Provide definitions for the following terms: valve seats, valve port, valve margin, and valve stem.

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Valve seats are the machined areas under the valves. Each valve fits snugly against its seat to provide a tight seal.

The valve port is the passageway before the valve seat.

The valve margin is the small, flat area between the valve head and the valve face. If a valve face is machined excessively, the margin of the valve will be too thin. The valve will overheat and burn when exposed to the high temperature of combustion.

The valve stem is smooth and polished. It fits into the valve guide.

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