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That sounds about right. I don't argue that the cars ran like cr*p, just that they were supposed to run on regular unleaded because that's all there was. Corvettes were no exception and as pointed out many times, if it was designed to run on 87 back then it'll run just fine on 87 today.
Well, I'm not sure I agree with this. If it ran like crap on 87 back then, I would expect it to run like crap on 87 today, unless something has changed. I think something has. IMO, the 87 octane gas you buy today is superior to the 87 octane gas we bought in 1975 because more effective additives are in use. This is based solely on personal experience, and not intended to be any kind of definitive or scientific statement.
But again, to bring this back to the original topic for the OP, I don't think the average Corvette owner with a car designed as a street engine needs to worry about running on pump gas unless it has been modified significantly. Engines like the LS5, L-48, L-36, L-46 were street engines and in my experience, in more or less stock set-up, will run fine on pump gas regardless of whether they are the higher compression '68-'70 versions or the lower compression '71-'74 versions. I have no experience with the woolier engines like an L-88, so if folks chime in here and say they have problems, I'll believe it, but I don't think the OP is looking for that kind of engine.
OK, one more fact on this: In 1961, Amoco removed the lead from their gasolines and sold "Red Crown" regular gas and "White Crown" premium gas. In the early '70s, they also introduced "Gold Crown Super Premium". Given that, I assume we were driving to the nearest Amoco station to get unleaded premium in 1976.
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Slideshow: A Jaguar designer's personal project imagines what a modern front-engined Corvette might look like if Chevrolet revisited the golden age of the Stingray.