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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 .
As a mid-year change, Mercury introduced the Boss 302 V8 on April 1, 1969, in conjunction with the introduction of the Cougar Eliminator (with the Boss 302 engine being exclusive to the Eliminator). A four-barrel "street" version of the Boss 302 produced 290 hp, while a 2x4-barrel "racing" version was rated at the same 290 hp (216 kW; 294 PS ...
Renowned for high-performance strength and durability, the Toploader (particularly the four-speed) equipped such sought after "A-list" cars as the Mustang, Talladega, AC Cobra, AC Frua and Sunbeam Tiger as well as the Ford Fairlane, Falcon, Galaxie, Ranchero, Torino, Bronco and the Mercury Comet, Caliente, Cyclone, (Mercury Cougar 1967 1973) and Marauder.
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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.
It was based on the Mustang SportsRoof model and replaced both the Boss 302 and the Boss 429 models. The Boss 351 engine was a 351 Cleveland four barrel engine with a mechanical cam, solid lifters, 11.0:1 compression ratio, aluminum intake, and a 4 bolt main bearing block. It was topped with an all-new 750 CFM Ford 4 barrel carburetor.
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 ...
A 429 cu in (7.0 L) version was also introduced the same year, with a 370 cu in (6.1 L) variant appearing in 1977. Produced until 1998, the 385 engines replaced the MEL engine entirely, along with multiple engines of the medium-block FE engine family; in truck applications, the engines succeeded the much larger Super Duty family.
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