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The Ford Mustang Mach 1 is a combination performance and appearance package offered as an option for the Ford Mustang in August 1968 for the 1969 model year.. Over the following years, the package was available with various engines that became more modest as emissions controls, unleaded gas, fleet mileage quotas, and higher gasoline prices undercut the "horsepower wars" that were the origin of ...
The 428 Cobra Jet was a performance version of the 428 FE. Launched in April 1968, it was built on a regular production line using a variety of cylinder heads [30] combined with a 735 CFM Holley four-barrel carburetor. The Cobra Jet used heavier connecting rods with a 13/32 rod bolt and a nodular iron crankshaft casting #1UB.
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.
Both a Mach 1 and base grille were offered, with differing insert patterns. Mach 1 decals were also revised in 1972 for 1973 models, and the previous hockey stick side stripes of 1971–1972 models became an option on hardtops and convertibles with the addition of the 'Exterior Decor Group'.
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 ...
Despite having camshafts that produce power at lower rpm, the Mach 1's 4.6 produced as much power as the '01 Cobra, in part to the revised 4-valve heads, and an increase in compression from 9.85:1 to 10:1. The Mach 1 was also equipped with 3.55:1 rear gears, making it capable of very low 13-second 1/4 mile ETs and ~106 mph trap speeds with an ...
A 600 CFM version of the 4300A with a 0.25" larger primary ventury and 0.20" larger primary and secondary throttle bores, was released in 1968. [1] By 1970, it was factory supplied on most Fords equipped with the 429 and 460, in addition to vehicles with the 351 Cleveland. [3] 4300A 600 CFM specs: [2] 1.25" primary venturi; Primary throttle ...
A new 5.8 L (351 cu in) four-bolt main Cleveland Engine, was used with lower compression ratio (from 11:1 to 8.6:1, chiefly to meet US emissions standards and run on lower octane standard fuel) but with the more aggressive "Cobra Jet" camshaft (featuring the same lift and duration as the 428 Cobra Jet's factory performance cam) in an effort to ...