How can you physically look at a motor and tell if it is OHV, DOHC or SOHC?

How can you physically look at a motor and tell if it is OHV, DOHC or SOHC?

This is not always easy because there are so many components covering what is considered the front of the motor. However, if you take all of the other stuff off the engine and take the timing cover off it would be very simple for anyone who has been around engines.

—Gerald Wheelus
Edgewood Auto Parts #253, Edgewood, Texas

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