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There are many differences but the basic ones. In a V8, pushrod engines use one cam to control all teh valves. A SOHC uses one cam in each bank of clyinders so it has a total of two. A DOHC uses two cams per bank of cylinders so it uses a total of four cams. For the most part, pushrod engines are more effiecent than SOHC and DOHC. Pushrods are also phyically smaller than there SOHC and DOHC engines of the same displacement. If you want to know more, ask Texan.
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