I used to have people walking away in mid conversation when I mentioned having a factory 427 Chevelle. They thought that they were being BSd. Can't blame them. These cars did indeed come with the 5-50 warranty. I don't know how GM looked at them after being modified by others. I still got warranty work done after installing headers with no problems. If everyone keeps beating the bushes, a few more might just show up.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.