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of OHC engines is that during engine repairs where the removal of the cylinder head is required, the camshaft engine timing needs to be reset. In addition, an OHC engine has a large cylinder head to accommodate the camshaft or an extra set of valves to increase the volumetric efficiency, so that with the same displacement as an OHV engine, the OHC engine will end up being the physically larger of the two mostly due to the

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