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An Italian company "Parilla" had a high cam motor that used one cam lobe for both the in and ex valve. It has a very cool timing cover, in my opinion.
I'm going to put this here "Found on Ebay" # 221253240359 a 1952 un-restored bike. Buy it now price is a little high but if one of our northern brothers gets it I would be able to pack it north for you if its before the meet in Portland.