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Generally, engines with dual overhead camshafts (DOHC) are higher performance engines, they produce more power, and can run at higher speeds. The biggest difference is that the DOHC has two camshafts, one thats controls the exhaust valves and the other that controls the intake. The SOHC just has one that regulates both. So the DOHC has better performance b/c of the two independent camshafts.
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