I'm not too sure of the year, but there was once a "Co-Op" tractor that had a Chrysler slant 6 for a power plant. They were governed to about 2200 RPM, but everyone that got ahold of them adjusted the governors to MUCH higher rpms. There was an old guy that lived near my parents place that would drive his to the local watering hole on saturday nights. I was driving along at about 30 MPH on our county road one afternoon when he (his name was ELVIS!) came blowing past me....ON A TRACTOR.... He must have been going about 45 or 50. (That's blowing past you when it's an old tractor) It was a tricycle front end. I bet that was a spooky ride. (especially on his way home in a slightly "medicated state")
My Massey Ferguson shows a top speed of 18 point something MPH @ 2150 RPM, and with stock rubber. I've turned up the "fast idle" screw to where it gets to 2400 RPM, and changed to a rear tire that's a tad over 4" taller than the original. She honks on at over 24 MPH now. With rather quick steering, that seems like MACH II.
So, Anyone wanna race?