Back in the early 1960s there were a very few UK companies whose business it was to improve the performance of road car engines. Standard car engines were, in general, very tame and, in 1961, the year that the Mini Cooper was launched, the British Saloon Car Championship was won in a Don Moore-tuned 850 Mini by John Whitmore, later Sir John. Minis of that specification were certainly on the road as well. Not many Mini owners were able to tweak their own Minis so Mini engine swaps would be largely restricted to using the hard-to-find Cooper and then S engines.
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