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Each car was given a "KK" number which stood for Kar Kraft. KK #1201 was the first Boss 429 and KK #2558 was the last Boss 429 made. [5] However, sales started to drop off for the 1970 Boss 429 Mustangs and with higher production costs and other internal Ford problems, it was decided that 1970 would be the last year of the Boss 429.
Later in the season, the Boss 429 engine was used by many of the teams, after it had finally been declared "officially homologated" by NASCAR president, Bill France. The Boss 429 engine was homologated in the 1969 Ford Mustang Boss 429. In a very unusual move, Ford homologated the engine separately from the car in which it was to race.
The Boss 429 Mustang debuted in January 1969. It was built primarily to allow Ford to campaign the special engine in the NASCAR racing circuit. NASCAR's rules stated that for any "trick" part or engine to be considered legal, it had to be installed on at least 500 cars that were sold to the public. The Boss 429 engine was rated at over 370 hp.
The Mach 1 proved popular with buyers with 72,458 cars sold through 1969. [66] The Boss 302 was created to satisfy Trans Am rules and featured distinctive hockey-stick stripes, while the understated Boss 429 was created to homologate the Boss 429 engine (based on the new Ford 385 series engine) for NASCAR use. The two Boss models received fame ...
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The 1969 Ford Mustang featured numerous performance-themed model names and engines. Six factory performance Mustang models were available (GT, Boss 302, Boss 429, Shelby GT350, Shelby GT500, and the Mach 1). Additionally, seven variations of V8s were available in the 1969 through 1973 models; most of these were also available in the new Mach 1.