George designed it?
Interesting.
My first stint at Fox Mfg (hired Aug 1970 as I recall), Duke was still working on getting that engine finished and into production. Duke was still in the process of developing the Schnuerle-type porting. There were raw case, backplate, etc, castings in barrels as well as other raw machined parts. Never a word was mentioned about George designing it.
I do recall an ingenious improvised method Duke created to watch the flow of the incoming fuel/air mixture. A back plate was drilled and fitted with a nozzle. A 3' piece of neoprene tubing was attached to it. On the free end, was a fitting that one could insert the filter end of a cigarette. The cigarette would be lit, and he would stick the cigarette into his mouth and blow. The incoming smoke would be directed by the porting and thus the porting could be fine-tuned to more efficiently fill the cylinder as well as fill the compression area.
After seeing Duke use his "flow-a-nator", I made my own and begin to use it to make mods to the X series of combat engines. Pretty ingenious idea, I always thought.
Andre