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The Mustang's engine compartment was not wide enough to accommodate the massive Boss 429 engine, so Ford contracted with Kar Kraft of Dearborn, Michigan, to modify 4-speed Cobra Jet Mustangs to accept it. Kar Kraft was a Ford exclusive experimental facility that functioned as Vehicle Engineering for Ford's Special Vehicles.
Ford developed two high-performance street versions of the 429 between 1969 and 1971, the Cobra Jet and Super Cobra Jet. The Cobra Jet (429CJ) was fitted with a Rochester Quadrajet 715 cu ft/min (20.2 m 3 /min) Spreadbore 4-bbl carburetor, a larger camshaft; a special set of cylinder heads (DOOE-R) 73.5 CC, combustion chamber and canted valve ...
The first was the 429 Thunder Jet, the standard engine for the Cobra, rated at 360 hp (270 kW). Next was the 429 CJ (Cobra Jet), rated at 370 hp (276 kW), which included a 2-bolt main block, hydraulic lifters, a 700 CFM Holley or 715 CFM Rochester Quadrajet carburetor, and was available with or without Ram Air. The top option was the 429 SCJ ...
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. Many experts think this may have been done in order to get the bodywork of the Talladega officially homologated at the beginning of the 1969 race season, as the Boss 429 was ...
The 428 Super Cobra Jet (also known as the 428SCJ) used the same top end, pistons, cylinder heads, camshaft, valve train, induction system, exhaust manifolds, and engine block as the 428 Cobra Jet. However, the crankshaft and connecting rods were strengthened and associated balancing altered for drag racing.
The 385-series V8 (the 429 for 1972–73; the 460 for 1974–76) was still available. However, all suffered from lower compression ratios to better meet new emissions standards. The 351 cu in (5.8 L) Cleveland could still be obtained in tuned 4-V Cobra Jet form through 1974. A four-speed manual transmission was available on Cobra Jet-powered ...
The 428 cu in (7.0 L) Cobra Jet engine continued unchanged in the 1969 and 1970 model years and continued to be advertised at 335 hp (250 kW; 340 PS). If a V or W axle was ordered (3.90 or 4.30 locking ratio) on any Cobra Jet Mustang, engine improvements were added to make it more reliable on the strip.
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.