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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.
The top option was the 429 SCJ (Super Cobra Jet), rated at 375 hp (280 kW), and was part of the "Drag Pack" option. Selecting the "Drag Pack" option turned a 429 CJ into a 429 SCJ. The drag pack required either the 3.91:1 or the 4.30:1 axle ratio, and included a 4-bolt main engine block, forged pistons, 780 CFM Holley carburetor, engine oil ...
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 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.
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]
The Boss 302 and Boss 429 were discontinued, with both Boss engines and the 428 Cobra Jet replaced by a 370 hp 429 Cobra Jet V8 (with or without Ram Air). [33] For 1972, Ford adopted SAE net horsepower ratings, leading to a numerical decrease in advertised engine output.
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 385-series V8 (the 429 for 1972–73; the 460 for 1974–76) was still available. However, all suffered from lower compression ratios to better meet new emissions standards. The 351 cu in (5.8 L) Cleveland could still be obtained in tuned 4-V Cobra Jet form through 1974. A four-speed manual transmission was available on Cobra Jet-powered ...