17 Muscle Cars That Were Built for Reasons No One Expected

9. 1969 Ford Mustang Boss 429: Racing Engine in a Street Car

The 1969 Ford Mustang Boss 429 exists because Ford needed to homologate its powerful 429 V8 engine for NASCAR competition. Rather than designing it purely for street dominance, Ford shoehorned this massive engine into the Mustang, creating a rare and formidable street machine with racing roots. Read the history at Road & Track.