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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.
Larry Shinoda of Ford is credited with introducing the shaker hood scoop as a factory-fitted option and campaigning to make it functional, first available exclusively for the 1969 model year Mustang equipped with the 428 Cobra Jet engine; [4] the option was expanded to other Ford Mustang engines for 1970 and imitated quickly by competitors ...
The 428 Cobra Jet was the largest Cougar engine, rated at 335 hp (with or without Ram Air). [ 12 ] As a mid-year change, Mercury introduced the Boss 302 V8 on April 1, 1969, in conjunction with the introduction of the Cougar Eliminator (with the Boss 302 engine being exclusive to the Eliminator).
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.
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.
1970 Ford Torino with 429 Super Cobra Jet, showing shaker scoop and intake. The Super Cobra Jet (429SCJ) was fitted with a Holley 780 cu ft/min (22 m 3 /min) Vac-Secondaries square-bore 4-bbl carburetor, larger mechanical camshaft, a four-bolt main block, forged pistons, single valve relief, [4] forged rods, and Brinell tested cast iron crankshaft.