* Early versions of the Chevrolet Corvette (C1): The first generation Corvettes, particularly from the early 1950s, were relatively lightweight compared to other cars of the time. While precise weights varied, some models weighed under 3000 lbs.
* Certain AMC models (like the Gremlin and Pacer): American Motors Corporation (AMC) was known for some budget-friendly, lightweight designs. While not always the *absolute* lightest, some models in their lineup fell into a lighter weight class than many competitors.
* Some very early Ford models: Ford's earlier cars, before significant weight additions for safety and luxury features, were considerably lighter than their later counterparts. Specific models and years would need further research to identify the lightest.
Important Considerations:
* Weight vs. Curb Weight: Manufacturers often report "curb weight," which includes the car's weight with standard fluids (oil, coolant, etc.) but *without* passengers or cargo. Total weight can vary significantly.
* Model Year Variations: Even within a single model, weight could change year to year based on materials, features, and engine options.
* Data Availability: Comprehensive, easily accessible weight data for every American car ever made isn't readily available.
To find the absolute lightest, one would need to painstakingly research original specifications for a large number of vehicles across many brands and model years. The names above represent strong contenders based on general knowledge of their design and era.