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OHC is not new technology. The only real benifit is running 4 valves per cylinder. If you made a ohv motor with 4 valves and had a DOHC motor with the same flow numbers and cam specs, the OHV motor would make equal or more power. Spinning 1 gear and a 1' chain is much easier than spinning multiple feet of chain and 4 gears.
Plus its cheaper to upkeep a ohv motor and easier to build and cheaper to upgrade.
But building all the engines you have, you already know that.
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