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are you sure about that? doesn't make much sense to me. Its a IPRA race car and the capacity classes are 0-1600cc, 1601-2000cc... you are allowed 2% tolerance on the max capacity, so you can run in 0-1600cc with a 1632cc engine.

It makes absolutely no sense as a racer to exceed that by 60cc and then have to compete against much larger displacement cars with capacities up to 2040cc.

it would be two thirds of stuff all different in output to the a slightly smaller engine which would then be at the upper limits of the 0-1600cc capacity limits and be much more competitive.

I think the old chinese whispers are coming into play.