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Well, besides the fact that the Chevrolet of the 1960s couldn't handle making a small car.
Remember that at the time the Hottest Car on the Market was the Volkswagen Beetle. Everyone wanted a piece of the Bug. Chevy did a Market Analysis and figured out that what the market really wanted was a flimsily-built, noisy air-cooled car with the engine in the back. (I love Bugs, but there's no getting around the fact that the car was designed to be built cheaply and quickly, and with interchangeable parts--lots of 1965 Bugs came out with 1964 bumpers and 1963 steering wheels because the bumper factory worked overtime in '64 and the steering wheel plant in '63, and the Bug factory just put old parts on the cars until the bin was empty.) Then they saw that a lot of people were hopping up their Bugs because a 1300cc engine that puts out 40 horsepower won't move the Bug very fast. So they naturally decided to put a bigger engine in their version of the Bug than the Germans were putting in the Porsche 911.
If you have a lot of weight in the back of a vehicle, you must compensate for it by differential air pressure--more air in the back tires than in the fronts, or bigger tires in the back than in the front. If your Bug still has the tire pressure sticker in the glovebox, look at it: for radials, 18psi in front, 28 in back. We ran 45/65 front/rear on our Army intercept positions for the same reason--stick a ton and a half in the back of a truck, don't differentially-inflate the tires, and the truck will try to turn itself around every second you're in it. (On a semi, you do the opposite--our delivery truck is a Freightliner, and it's 95 in the back, 110 in the front. There is a 550-horse Mercedes-Benz engine in it, which weighs two tons if it weighs an ounce. You gotta compensate because when that truck is empty, forty percent of the weight of the whole rig is sitting between the front wheels.) Porsche's 911 has larger tires in the back than in the front, with effect that if you get a flat, you gotta be real careful about how you drive until you get the real tire fixed. I think the Boxster is the same way; I know the new Carrera S has bigger tires in the back, and of course open-wheel race cars are that way. (Open-wheel race cars have four different size tires on them because of "stagger," Ralph Earnhardt's contribution to the world of sport. It seems that by putting larger tires on the right side of a car that only turns left, it's easier to drive it.)
Chevrolet didn't tell anyone this. Or at least they weren't real emphatic about it. Corvair owners did what they did with their last car, put 32psi in all four, and wound up crashing the things with some regularity.
Chevrolet could make a New Corvair and not upset Nader much, because a New Corvair would be front wheel drive like every other car on the road.
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