I was at the 1989 Ely-to-Hicoh race.
One person's (wife of the driver) was killed when a non-Z rated tire on their Ferrari Testarossa shredded a left rear tire at 170+ and went off the course, went end-over-end and ended up on it's lid on fire. The driver was busted up, but lived.
The Ferrari owner/driver had to sign all kinds of waivers at the tech inspection the day before because his tires were not Z-rated. His argument was "if Enzo fitted the car with them, then that means they are good enough." WRONG.
The EMTs life-flighted both driver and passenger to Las Vegas right in front of me at the finish line.
Other than that, the race was a lot of fun to watch. At the time I owned a BMW M6, but I didn't dirve it at the race. There was one in the race that averaged about 160+ with a top speed of about 170.
A YouTube video about that race:
https://youtu.be/e-PFfwxR3SQ
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Craig Hendrickson, the "H" in H-O Racing Specialties.
http://www.OriginalHO.com