So GCC Sherlock got it right! No 4 valve engines, which is significant. No sign of any other info on the web yet......
SPORTSCAR 2000
"This brand new international historic series for 1961-71 two-litre cars features 1300, 1600 and 2000 classes and, by excluding four-valve machines, provides a showcase that allows smaller-engined but highly exciting racing cars such as Porsche 904 and 906, Chevron B8, Lotus 23B, Abarth and Alfa Romeo TZ, to race against each other on a hugely entertaining and competitive ‘level playing field".
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