In the high-stakes world of collectible muscle cars, a dealership's refusal to sell a 2023 Dodge Challenger SRT Demon 170 for $162,000 has sparked discussions among enthusiasts and collectors alike.

Values for old American muscle cars are slipping faster than many owners ever imagined, and the shift is not just a blip on an auction screen. After a decade when V8 icons felt like can’t-miss ...