The 1275 Cooper s was on standard bores: boring to plus 60 thou gave a swept volume of 1293.
Homologation allowed re-boring to within standard factory recommended limits.
Since the then saloon class limit was 1300 c.c and as every little helped, most competitive race and rally cars were 1293.
All of our 1275 s cars were run at 1293 c.c.
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