Went for a very nice drive in the country with Gregg Temkin, in his '74 2500M, last Weekend. He thought we should visit a town called Carnation, and look into a dealer's showroom. Some of the better things below.
Carnation is Northeast of Seattle. The third bike was a turbocharged Allison V12 of 27 liters displacement with drag slicks. There really wasn't much more to it. I believe the rider sits on some type of cast alloy chain housing. It was actually too insane to to photograph.