7: Pontiac Catalina 421 Super Duty
The Pontiac Catalina 421 Super Duty was a well-known entity early on in the Pontiac lineup. However, later on, the car failed to catch on with consumers in the same way as the other models did. The 421 V8 engine was by far one of the most powerful that GM put out at the time, leading to a sales resurgence.
Sadly, the car just couldn’t attract enough consumers to stay on the market and the 421 Super Duty was dropped from the lineup. There were several reliability issues and questionable build quality that made the car get a bad reputation with consumers.