A few companies do continue to use OHV setups, and generally with two valves per cylinder. While almost any combination of valves is possible with any valvetrain, the majority of engines today are DOHC with four valves per cylinder. Over the years automotive manufacturers have tried various combinations of valvetrains and valve counts. Direct gearing to run the camshaft can sometimes be used as well since it is much closer to the crankshaft, rather than relying on a timing belt or chain. Rather than using four camshafts on a V8 engine block, just one can be used.
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