6. Boss 302
If the Boss 429 was a beast designed for NASCAR, the Boss 302 was a totally different kind of animal. Ford made this engine with Trans Am racing in mind. Thanks to the Mustang, Ford was a popular choice on SCCA races. When the SCCA started turning into a popular Trans Am series, Ford wanted another championship title. Since Shelby American stopped working with Ford in late 1967, Carroll Shelby was not there to help prepare the newly introduced 1969 Mustang for the Trans Am.
So, Ford made a new engine and put it in a new model. The Boss 302 engine was small compared to Cobra Jet or Boss 429, but it was a high-revving, powerful motor. The displacement was 5.0-liters at 302 CID, and the factory rated it at 290 HP. However, the real output was closer to the 350 HP mark. They offered the Boss 302 at a relatively affordable price as a basic package. It proved to be popular, with Ford producing over 8,500 units in 1969 and 1970. Many Mercury Cougars also received Boss 302 engines with the same specifications.
Boss-powered Mustangs were competitive in 1969 at the race tracks, going on to win the championship title in 1970, despite facing tough competition from Chevrolet, Dodge and Chrysler.