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The distinctive enormous valve covers on a semi-hemispherical head Boss 429 engine. 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 ...
The engine became marketed in metric in 1979, as the 7.0L V8. [2] Initially replacing the 401 Super Duty V8, the 7.0L replaced the 477 and 534 Super Duty engines for 1982. After 1991, the 429 became the sole gasoline engine offered in medium sized and larger Ford trucks; the 460/7.5L was only used in trucks under 1½-ton payload. 429 Police ...
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.
1963–1971 Ford Indy V8 engine (U.S.A.C. IndyCar engine) 1968–1997 385 V8—big-block (370/429/Boss 429/460/514) 1975–2007 Ford-Cosworth Indy V8 engine (U.S.A.C. IndyCar engine) 1970–1982 335/Cleveland V8— small-block (351 Cleveland/400/351M/Boss 351) 1969–1982 Ford Australia produced Cleveland V8 engines 302/351 (Geelong plant)
Later models came with hydraulic clutches. These were commonly found in Pintos, some Mustang II/Capris, and Rangers but do not match the V6 Bell housings. Changing the engine to a V6 often requires changing the bellhousing (Mitsubishi) but the Mazda trans had an integral bell. 2.6, 2.8, 2.9, and 2.9 Cosworth. Most of these were RWD car engines.
Additionally, a variety of performance packages were introduced that included the Mach 1, the Boss 302, and Boss 429. The two Boss models were to homologate the engines for racing. The 1969 Mustang was the last year for the GT option (although it did return on the third-generation Mustang for the 1982 model year).
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.
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.