46. Ford Mustang 289 Hi Po
Although the Mustang looked sporty, it shared modest underpinnings with the economy Falcon. Its engine lineup included mild versions of inline-six and small V8 units. The power output was nothing special and the performance was somewhat below expectations. Ford responded with an interesting engine called the K-Code (via Petrolicious).

The K-Code was the 289 V8 but with the milder, more street-friendly tune and 271 HP, more than enough for the performance Mustang fans asked for. Introduced in 1965 and available until 1967, the 289 HiPo was the first Mustang that ran as well as it looked.