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The Boss 429 was produced in limited numbers in 1969 and 1970. Its origin is twofold: allow Ford to homologate its new Ford 385 engine -based semi-hemispherical 429 V8 for NASCAR racing, and to provide a big block alternative to the 5.0 L and under Trans Am Racing bred small block Boss 302 Mustang .
At mid-year, Ford offered a slightly detuned Boss 351 engine, which could be ordered with any model. A total of 398 Mustangs were built with the drag race-oriented R code engine and were designated as the 351 HO. Mandatory options were the top loader 4-speed, competition N case rear end (427, 428, 429, Boss 351, 351HO), and air conditioning delete.
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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.
Boss 429 Mustang From a page move : This is a redirect from a page that has been moved (renamed). This page was kept as a redirect to avoid breaking links, both internal and external, that may have been made to the old page name.
The Mustang Boss 302 is a high-performance 302 cu in (4.9 L) H.O. V8-powered variant of the Ford Mustang originally produced by Ford in 1969 and 1970. Developed to meet homologation requirements to compete in Trans Am racing, it was Ford's response to the success of the Chevrolet Camaro Z/28 in the 5 L (305.1 cu in) and under SCCA series since 1967.
After the 1970 season, NASCAR effectively banned the "aero cars", by restricting all four of the limited aero "production" cars to having to compete with engines no larger than 305 cubic inches of displacement (vs. the 426, 427, & 429 inches that the other cars could run), and the competitive history of the Mercury Cyclone Spoiler II (and its ...