Actually this is 1960 with Corvettes at lemans.
No factory backing, but independents won first in class

30 munite video
https://www.youtube.com/watch?v=aGCGz6rAEts

In 1960 GM was not officially affiliated with any of the teams, but for the first
time Corvette was on the grid and GM commissioned a short documentary to
be filmed. The #3 Corvette persevered and took 1st in class.

caribman10
My real question is, where was Briggs Cunningham in this documentary? It was his team and his cars, at least nominally. Then again, and this is true, after the race these cars were returned to the US, repainted and sold as street drivers. No kidding. Some guy drove the LeMans class winning Corvette as his regular street driver...