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BSR is "B Sports Racing", the SCCA's second division of sports car racing for cars up to 2 litres. It started around 1967 with Porsche 911s and the occasional Brabham BT8 and was chock full of Lolas and Chevrons by 1976. It was allowed into Can-Am in 1977 as the second class and continued in that form until at least 1986. A Lola T290 and a Chevron B21 competed as late as 1986. By that time a 2-litre sports could also be used in historics which is where most Can-Am cars went after 1986.
SCCA Nationals were the most important races organised by the (then) seven SCCA Divisions. There were 50 or 60 a years until 1978 when they changed into Supernationals, or which there were about 15. Not sure what happened to them after that. Below that are SCCA Regionals that are organised by the (dozens of) regions. Nationals are very poorly reported by Autoweek and Regionals are typically not reported at all. These were all amateur races of course, equivalent to UK clubbies.
The big one every years was the Run-Offs, also known as the ARRC and later the CSPRRC. This was an end-of-season event competed by the divisional champions to determine the national (amateur) champion. Run-offs results are available online thanks to Nick England.
Allen
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