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I've only seen one myself Roy...
...and this is it. VF7023. It was acquired from Marshall Grant at the same time as the D motor. There is quite a history behind it also and like the D, it went to Harry Bartolomei, so at one time it was in California. Don't know where it is now.
Marshall brought some of the first, if not the first, square block Konigs to the U.S. As far as I know the first square blocks were built in 1970, or maybe being cast in late 1969. Maybe Sam could help us here.
I don't know if any other double rotary valve konigs exist. This one has another rotary valve and set of carbs on the exhaust side. The block was cut away and this rotary valve was mounted offset, slightly higher (may correct after I see the photo) than the other rotary valve. This is because it runs the same exact belt as the front side rotary valve, but they run on the same gear--one belt above the other.
The primary problems costing a race were two. Blown lower unit and losing one rotary valve belt. Belt problems normally occurred when the motor was started. If it happened, it would be one belt popping. Once the motor was running, it was surprising how few belt problems there were.
As one pit man learned, don't look into the carb on the exhaust side when Jack squirted gas in the motor to start it. You could see clear through the motor on the carbs where the valve was open. If the gas didn't hit the crank, you would get a shot of gas in the eye.:(
As I research the D motor, info on the DRV F pops up so after I get down with this I may post some more stuff on the F. I keep finding things I forgot about. Here is a photo of the F. I was just looking at this pic to try to figure out which motor on the rack was the D.