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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 428-4V Cobra-Jet was the most potent engine available for 1968, and is general believed to be under-rated at 335 hp (250 kW). [5] The cars equipped with the 428 Cobra Jets had emblems borrowed from the full-sized Fords (a red-and-chrome badge reading "428") mounted on the fenders behind the parking lamps.
All production Talladegas were actually equipped with the new 428 Cobra Jet, which, while very powerful and reliable, was intended as a street engine for Ford's muscle cars, as it developed high torque at low RPMs, rather than being a high-revving race engine.
1969 Mercury Cyclone Cobra Jet. Mercury also added a new model to the Cyclone line: the Cobra Jet (CJ). The Cobra Jet's engine was a 428 cu in (7,014 cc) which generated 335 hp (250 kW). The engine had a Ram Air option, a 735 CFM Holley four-barrel carburetor [3] although the option showed no quoted difference in horsepower rating.
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 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.