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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.
Boss 429s don't trade hands often, and when they do, few are as nice as this one. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: ...
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.
For 1970, the two-barrel 351 remained the base engine, with the four-barrel engine replaced by a 351 cubic-inch "Cleveland" V8, rated at 300 hp (224 kW; 304 PS). While unchanged in displacement, this engine was an all-new design. The 390 was dropped, with the 428 Cobra Jet remaining alongside the Boss 302 as the high-performance engine options.
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.
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.
The smallest-displacement engine of the 385 engine family, the 370 was introduced in 1977, replacing the 361 cu in (5.9 L) 360 Truck (FT) V8. Sharing its 3.59-inch stroke with the 429, the 370 was designed with a downsized 4.05-inch bore (shared with its predecessor and the 390 V8).