23: Chevrolet Corvair
GM sought out a new segment in 1960 dubbed “Thrift” cars, vehicles that would be more affordable than the average car. Instead of having to purchase a used car, a consumer could get a new one. It was a terrific idea if it was executed properly, yet it was not. The Corvair is one of the worst Chevy models of all-time (via Gold Eagle). It ‘featured’ a paltry Turbo Air six engine with 80 hp and a three-speed manual.
It was also from around the time cars were made of steel. The critics labeled the Corvair unsafe, a mark it never recovered from. Insufficient performance in the Corvair marked a departure from traditional Chevy engineering. The interior also marked a decline in quality for Chevy, something customers weren’t forgiving of.