Let me sub for Kelly who's away from his computer this weekend as I was wondering the same thing; I pulled the following off a couple of related sources.
The first liquid-cooled snowmobile was the
1972 Brut LC44, built by Brutanza Engineering, Inc. of Brooten, Minnesota. The company was later bought by Scorpion Industries, which produced the liquid-cooled Scorpion Bruts starting in 1974.
- 1972: Brutanza Engineering created the first liquid-cooled snowmobile, the Brut LC44, with a radiator for cooling.
- 1973: Brutanza replaced the radiator with heat exchangers, which were another industry first.
- 1974: Scorpion Industries bought Brutanza and produced the liquid-cooled 340 and 440 models as Scorpion Bruts.
Chaparral introduced its liquid-cooled
SSX model in 1974.
I believe that's the model that "the K Man" is restoring.