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429 Police Interceptor. The 1971 429 police interceptor was tuned similarly to the 429 Cobra Jet, with an 11.3:1 compression ratio. Featuring forged notched pistons [clarification needed] the engine was rated at 370 hp (gross). [citation needed] Applications: Ford Thunderbird (1968–1973) Ford Mustang (1969–1971) Ford Mustang Boss 429 (1969 ...
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.
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.
A new option for Cobra models was the reflective laser stripe, formerly an option for just GT models. Although the high-performance 429 Cobra Jets were still rated at the same power as the 1970 models, Super Stock and Drag Illustrated had disappointing results from its test of a 1971 Torino Cobra. They tested a Cobra equipped with the 370 hp ...
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.
429 Ford Thunderjet. The 1968 Thunderbird saw the introduction of the new 385 series big-block "Thunder Jet" 4V (4 barrel carburetor) 429 cu in (7.0 L) V8 engines. Like many Ford engines of the time, they were conservatively rated at 360 hp (268 kW) (SAE gross).
The addition of emissions controls and the adoption of unleaded fuel required lowered compression ratios and retarded ignition timing. In one example, the range-topping 429 V8 would see its output drop from 365 hp to 212 hp from 1971 to 1972. In 1972, the 429 was joined by a 224-hp 460 cubic-inch V8 seen previously in the Lincoln lineup. [32]
The Q-code 351 "Cobra-Jet" (also called 351-CJ, 351-4V) was produced from May 1971 through the 1974 model year. It was a lower-compression design that used open-chamber 4V heads. [ 5 ] The open-chamber heads exhibited superior emissions characteristics and were used to meet the more stringent emissions standards for 1972 and beyond. [ 1 ]