The Canadian-American Challenge Cup (Can-Am) from 1966 to 1974 gained cult status among motorsport enthusiasts because there were basically no rules for the design of their cars.
The FIA-approved Group 7 regulations it was driven under only dictated that cars had an enclosed body and room for two people.
However, it is not as well remembered that Europe had its own (though much lesser known) Group 7 championship called the Interserie from 1970-1976.
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In May 1972 we reported on his first race at Silverstone. Eighteen “big bangers” were reported, although unfortunately none of British Can-Am leaders Lola and McLaren, the former’s new car unfinished and the latter busy with the Indy 500.
The front row was blocked by Porsche 917s, with Bosch-backed Willi Kauhsen passing 1971 AAW champion Leo Kinnunen, both factory-backed.
The Finn was comfortably leading the German on lap 28 of the first 35-lap race, then suddenly they both got a puncture and it started to rain.
After putting on slicks, Kinnunen lost 45 seconds to Willie Green’s JCB-operated Ferrari in just five laps.
No such drama happened to the AAW man in the second race, allowing him to take the overall win ahead of Green.
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