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Originally Posted by dimefury
some things are worth the weight....
OHC engines have fewer moving valve train components, less moving weight, this greatly reduces valve float at high rpms and allows a OHC engine to rev higher. more revs = more power
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OHC engines generally also have worse powerbands (read: little low end power for OHC, better torque curve for OHV) are less fuel efficent, and cost more to produce. The point is both designs have their advantages and disadvantages.