 | The origin of the Boss 429 came about as a result of Ford’s desire to compete in the top NASCAR series. Ford was seeking to develop a "Hemi" engine that could compete with the famed 426 Hemis from the Mopar camp - the 426 Hemi Charger Daytona and the Plymouth Superbirds. The Boss 429 ci OHV V-8 engine was rated at 375 HP while actual output was well over 500 HP. |
 | In 1969 there were 859 Boss 429s made by Ford, two of which were Cougars for the Lincoln/Mercury Race Division. There were five different colors available and the only color for the interior was black. |  |
 | #1 Concours examples trended around $455k in 2025 according to Hagerty. Condition #1 vehicles are the best in the world. |
 | In 2015 a 1969 Ford Mustang Boss 429 with a nearly unbelievable 120 miles on the clock sold for $247,000 That number would be much, much higher today. |  |
 | KK No. 1857 brought $231k at Mecum's in 2019. Prices have exploded in the past 5 years. |
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