I worked for Dekalb sead corn as a summer job several years in the 70’s. This included driving a “High Boy” rig made by Hague that cut the tassels off of the female rows of corn. They used a Wisconsin V4 that was a very bulletproof engine. Someone told me that they have been modified for use in some dirt track racers also.
Just looked it up. That’s the one.
Back in 61, my dad and a local blacksmith mounted v4 wisconsin on the right side of a John Deere 730 diesel. Used a wide flat belt from motor to the big flat pulley on tractor. It added about 20 hp, which came in handy when plowing some of the rolling clay hills we had.
But it had a straight pipe and was deafening when Dad opened up throttle on it and tightened the belt. On level ground he would sometimes shut it off and just tighten the belt to start it up when needed.