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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.
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 ...
Later versions of the 351C with 4V heads continued to use the large ports and valves, but switched to open chamber heads in an effort to reduce engine emissions. Only the Q-code 351 "Cobra Jet" (1971–1974), R-code "Boss" 351 (1971), and R-code 351 "HO" (1972) versions have four-bolt main bearing caps, [3] however, all 335 series engines could ...
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 ...
Later models came with hydraulic clutches. These were commonly found in Pintos, some Mustang II/Capris, and Rangers but do not match the V6 Bell housings. Changing the engine to a V6 often requires changing the bellhousing (Mitsubishi) but the Mazda trans had an integral bell. 2.6, 2.8, 2.9, and 2.9 Cosworth. Most of these were RWD car engines.
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.
Engine choices began with the 250 cubic inch I6 and ran to several V8 choices, including the standard 289 with two-barrel carburetor, and the FE-based 390. The powerful 428 cu in (7.0 L) Cobra Jet, another FE derivative and the largest engine offered in the Ranchero to date, was a mid-1968 option. The 1968 model marked the final year of ...
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.