313 Canadian market vs. 318 US market: In the 1960s Canada still had a road taxation system based on the egregious RAC horsepower system. This caused a rise in road taxes to come with an increase in bore, rather than stroke. To fit the Canadian variant of the 318 poly engine into a slightly cheaper taxation class, bore was reduced. Nothing to do with making poor old Canadians think they had an inferior car!
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