The 1969 Ford Mustang Boss 429 Fastback is widely regarded as the ultimate prize for Blue Oval collectors, but this specific example carries a pedigree that transcends standard production. Known as KK no. 1429, this vehicle has been a cornerstone of the Roush Automotive Collection for decades. Purchased by Jack Roush in 1971 for just $1,100, the car arrived with a blown engine and a history of drag racing. Roush viewed the damaged icon as a personal challenge, transforming it into a testbed for his legendary engineering prowess and creating what would become one of his favorite personal vehicles.
Royal Maroon and NASCAR Visual Authority
The visual character of this Boss 429 is defined by its deep Royal Maroon paint, a shade that emphasizes the aggressive “SportsRoof” silhouette. Because the Boss 429 was built to homologate the massive engine for NASCAR, the exterior features wide, functional elements like the signature oversized hood scoop and a deep front spoiler. This example retains its period-correct 15-inch 5-spoke Mag-style wheels wrapped in Firestone Wide Oval tires. Fog lights and a blacked-out grille complete the menacing look. The hand-formed flared fenders, necessary to house the widened track, remain a testament to the specialized assembly performed at Kar Kraft.
Wood-Grain Luxury Meets Racing Function
The cabin is finished in classic Black vinyl, offering a sophisticated contrast to the exterior’s rich maroon hues. Authentic wood-grain trim adorns the dashboard and door panels, creating a premium atmosphere typical of high-end Mustangs from the era. A wood-rimmed steering wheel provides a tactile connection to the front wheels, while a Philco pushbutton radio and an in-dash clock offer nostalgic charm. This interior serves as a comfortable sanctuary from the mechanical violence under the hood. Every detail reflects the meticulous restoration work conducted by Roush and his close associates to ensure the car looked as good as it performed.
Pro Stock Engineering by Jack Roush
Performance is where this Boss 429 deviates from the factory norm, utilizing a 460 CI short block Pro Stock engine built by Jack Roush himself. The engine features a 0.5-inch stroke and a mechanical-lift camshaft, modifications that reflect Roush’s expertise in squeezing maximum power from the Ford big-block architecture. This V-8 produces an estimated 515 hp / 522 PS and 500 lb-ft / 678 Nm of torque. Power is managed via a four-speed manual transmission and a 3.20:1 ring-and-pinion rear end sourced directly from Roush’s NASCAR program. The result is a car that delivers massive torque with the refined tuning only a racing legend could provide.
| Specification | Detail |
|---|---|
| Engine | 460 CI Roush Pro Stock V-8 |
| Transmission | 4-Speed Manual |
| Rear End | 3.20:1 Roush NASCAR Spec |
| Wheels | 15-Inch 5-Spoke Mag-Style |
| Brakes | Power Front Disc / Rear Drum |
| Serial Number | KK No. 1429 |
A One of One Collector Opportunity
While a standard 1969 Ford Mustang Boss 429 Fastback is already a blue-chip asset, the Jack Roush connection places this vehicle in a different market tier entirely. It competes with the most significant Shelby and Cobra Jet examples, but its unique mechanical configuration sets it apart from “concours-correct” assembly line cars. The value here is driven by the fact that it was “massaged” by one of the most successful engine builders in American history. Collectors who prioritize historical significance and performance over factory-original specifications will find this to be an unrivaled opportunity to own a piece of the Roush legacy.
Investment Potential and Mechanical Integrity
The investment potential for this Boss 429 is anchored by its exceptional provenance and the quality of its mechanical restoration. As one of Jack Roush’s personal favorites, the car has been maintained to a professional racing standard, ensuring its reliability is far superior to an unrestored survivor. The combination of a 460 CI Pro Stock heart and NASCAR-derived driveline components ensures it is a standout performer on both the show field and the open road. Owning KK no. 1429 is not just about owning a Mustang; it is about possessing a curated chapter of Jack Roush’s legendary journey through American motorsports.
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Source: mecum.com
