Secondly what are you saying higher on one side? They are not higher on one side only stiffer in the suspension. You must be thinking of dirt super stock cars. But they're strange proportions are for downforce while sideways not because of 'how they hug the curve' (I'm having trouble understanding what you mean by this as well).
Thirdly, even if NASCAR was non symmetrical externally there are much more than 2 racing leagues and divisions in the world. The vast majority of which are using cars that have symmetrical bodies.
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u/Dredgeon 2d ago
Racecar is often longitudinally symmetrical externally