Vauxhall is a British Chev, The DX was a slightly smaller body than the full size Chev/Vauxhall GY. On old speed equipment, how much of the technology in these, was done by intuition of the manufacturers, & how much on science/testing? I ask as friends years ago had Ford V8 gear from the sixties that looked good but only increased fuel consumption! I think people like POTVIN did test, but have doubts on some of the creations I have seen.
