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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 1971 429 police interceptor was tuned similarly to the 429 Cobra Jet, with an 11.3:1 compression ratio. Featuring forged single valve [clarification needed] notched pistons the engine was rated at 370 hp (gross). [citation needed] Applications: Ford Thunderbird (1968–1973) Ford Mustang (1969–1971) Ford Mustang Boss 429 (1969–1970)
The Ford Mustang Mach 1 is a combination performance and appearance package offered as an option for the Ford Mustang in August 1968 for the 1969 model year.. Over the following years, the package was available with various engines that became more modest as emissions controls, unleaded gas, fleet mileage quotas, and higher gasoline prices undercut the "horsepower wars" that were the origin of ...
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. Included was an engine oil cooler (making AC not available as an option), stronger crankshaft and conrods, improved engine balancing, and was named the 'Super Cobra Jet'.
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.
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 ...
Knudsen was also credited (and heavily criticized) for ordering the design of a larger Ford Mustang from a sporty compact ponycar to a heavier and almost-intermediate sized car for 1971, with much of the enlargement reported to be necessary in order to fit Ford's large 429 cubic-inch Cobra Jet V8 under its hood without extensive modifications ...
The second-generation Cougar underwent a revision of the powertrain offerings. For 1971, a 240 hp 351 Cleveland two-barrel V8 was the standard engine with a 351C four-barrel V8 as an option. [29] 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).
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