POLARIS ANNOUNCES INDY 400

Snowmobile Magazine - September 1983
ROSEAU, MN. - A limited build of a third Indy model, dubbed the Indy 400, has been announced by Polaris for the 1984 season.  After finalizing the 400cc liquid cooled twin Polaris, engineers have been working on for two years, the sledmaker decided in late July to schedule the small initial build to gain consumer experience with the new design before going to full scale production for 1985.
The limited build Indy is a liquid cooled, oil injected, high-performance model positioned between the popular Trail and 600 Indys.