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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 standard engine for the base Cyclone was the 429 cu in (7,030 cc) four-barrel with dual exhaust that was rated at 360 hp (268 kW) SAE gross (250 hp (186 kW) net). It was the standard engine in the 1970 Mercury Marauder X-100 and was available in other full-size models.
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 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 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 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).
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]
Later in the season, the Boss 429 engine was used by many of the teams, after it had finally been declared "officially homologated" by NASCAR president Bill France. The Boss 429 engine was homologated in the 1969 Ford Mustang Boss 429. In a very unusual move, Ford homologated the engine separately from the car in which it was to race.