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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 ...
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 ...
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 ...
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 429 Cobra Jet with Ram Air was the standard engine for the Cyclone Spoiler, with the 429 Super Cobra Jet with Drag Pak and Super Drag Pak optional. The Super Cobra Jet upgraded the block to four main bolts and provided a mechanical flat-tappet camshaft, and the carburetor was changed from a 720 cfm Rochester QuadraJet to a 780 cfm Holley.
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.
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).