Are you sure it was a Northway because I had a 1971 Arctic Cat 440 EXT and it was pretty quick. I raced a guy with a 440 Speedway and it was even faster. One of the quickest sleds around in 1972.
Not sure about the name But I am sure of the 440.
My mom and I was driving down hwy 51 in Illinois and he flew by us like we was standing still. We was doing at lest 55 mph.
