After he retired from drag racing, Potter put the V-12 engine in a tractor and entered it into tractor pulling contests. That led to a double engined tractor with 3400 HP!
Bert, one of my neighbors who had raced a Harley engined dragster himself, was quite impressed by the V-12 power plants. "Yeah those Allison engines, they sound like nothing you hear today, the sweetest sounding engine ever." And the conversation moved on to old airplanes.
So never did get to the point of the story; that this self styled madman spent most of his life riding crazy fast motorcycles, never was seriously hurt, and built some pretty fantastic machines by himself, with no sponsorship or engineering help. Amazing. EJ Potter died in 2012 at 71. He supposedly was planning a comeback on the V-8 motorcycle just before he died.