The Boss 429, sometimes referred to as the "Boss 9" by blue oval enthusiasts, is arguably one of the rarest and most valued muscle cars from the era. The origin of the Boss 429 came about as a result of Ford’s desire to compete in the top NASCAR series. Ford was seeking to develop a "Hemi" engine that could compete with the famed 426 Hemi winged warriors from the Mopar camp - the 426 Hemi Charger Daytona and the Plymouth Superbirds. At the time, NASCAR required that at least 500 cars be fitted with the competition motor and sold to the general public. The Boss 429 engine featured aluminum cylinder heads, which had a modified Hemi type combustion chamber which Ford called "crescent". The Boss 429 engine used a single Holley four barrel carburetor rated at 735 CFM mounted on an aluminum intake manifold. All these cars had 4-Speed Manual Transmissions and the Boss was rated very conservatively at 375 HP while actual output was believed to be well over 500 horsepower. Mustangs' were simply too small to accept the massive Boss 429 engine so Ford hired Kar Kraft of Brighton, Michigan to modify existing 428 Cobra Jet and Super Cobra Jet Mach 1 Mustangs to properly fit the new Boss 429 engine. Kar Kraft made extensive modifications including widening the shock towers and extending out the inner fenders to allow this monster engine to fit. The mounts for the front suspension were chopped and displaced to create room for the block and exhaust manifolds. The battery was repositioned to the trunk and a stiff 3/4" sway bar was added to rear end to improve handling since the car was now nose heavy. It was also equipped with a 3.91 ratio rear axle with a "Traction-Lock" limited slip differential. In addition, a hole was cut in the hood, and a manually controlled hood scoop was added to these cars. Other features included a front spoiler and color keyed dual racing mirrors. All Boss Mustangs are simply big block power with few options and offered in only five different colors in 1969: Raven Black, Wimbledon White, Royal Maroon, Candy Apple Red and Black Jade. These very special cars were given NASCAR identification that was placed on the driver's side door. Each car was given a "KK" number which stood for Kar Kraft and all cars after KK#1480 no longer had the much more desirable "S code" engine. The Boss line featured a toned down exterior, as compared to other Mustangs of the era such as the Boss 351 or Mach 1. Just a very plain external identification of the car were the White Boss 429 decals on the front fenders, small functional Black Front Air Spoiler and no Rear Spoiler or Rear Window Louvers… a clean look that some fanatics refer to as the look of a 'sleeper'" with no flashy racing stripes to announce the power.
This 1969 BOSS 429 is a true survivor being one of only 859 Boss 429’s produced. Captivating in the factory Candy Apple Red the paint is bright and predominantly clear with areas which reveal its original character seen by the various marks, minor topical scratches and natural patina. The body panels, doors and trunk lid have good fitment with typical gap space for the era and line up well. The chrome and metal surfaces are in good original condition with the bumpers displaying minimal deterioration. All of the trim pieces are original and are damage free. It has the factory correct raised white lettered Goodyear Polyglas tires on Magnum 500 Wheels, which have very good chrome. On the hoist, the undercarriage is reflective of an original never restored car, however, as can be seen in the pictures, this one is exceptionally clean and impressive. The drivetrain is as it was from the factory with its original transmission and rear end. Lifting the hood you can appreciate how the massive "S" Code 429 cu. in. engine had to be wedged in to fit the engine bay - which is original, very clean with no signs of rust or decay. The interior features factory Black Clarion Knit Vinyl Hi-Back Bucket Seats on black carpet, both of which are original and in very nice condition. The steering wheel, console and door panels are original and show average wear for its low mileage and age. Overall, this car is a truly beautiful survivor and presents a very unique opportunity in which to purchase an extremely desirable, original, fully documented, early production "S" Code Boss 429.
At Concours events nationwide “Preservation Classes” have been added to showcase well preserved and mostly unrestored, un-refinished, and unaltered cars. In "Hagerty's Cars That Matter" they observed unrestored cars sell for prices that would have astonished in the recent past. The vintage and muscle car hobby is headed in the direction of the fine art, decorative arts, and antique furniture markets, where a premium is placed on originality.