Worldwide Auctioneers
  1. 1970 Ford Mustang Boss 429

  2. 1970 Ford Mustang Boss 429

  3. 1970 Ford Mustang Boss 429

  4. 1970 Ford Mustang Boss 429

  5. 1970 Ford Mustang Boss 429

  6. 1970 Ford Mustang Boss 429

  7. 1970 Ford Mustang Boss 429

  8. 1970 Ford Mustang Boss 429

  9. 1970 Ford Mustang Boss 429

  10. 1970 Ford Mustang Boss 429

  11. 1970 Ford Mustang Boss 429

  12. 1970 Ford Mustang Boss 429

  13. 1970 Ford Mustang Boss 429

  14. 1970 Ford Mustang Boss 429

  15. 1970 Ford Mustang Boss 429

  16. 1970 Ford Mustang Boss 429

  17. 1970 Ford Mustang Boss 429

  18. 1970 Ford Mustang Boss 429

  19. 1970 Ford Mustang Boss 429

  20. 1970 Ford Mustang Boss 429

  21. 1970 Ford Mustang Boss 429

  22. 1970 Ford Mustang Boss 429

  23. 1970 Ford Mustang Boss 429

  24. 1970 Ford Mustang Boss 429

  25. 1970 Ford Mustang Boss 429

  26. 1970 Ford Mustang Boss 429

Lot Number
115

1970 Ford Mustang Boss 429
2017 The Texas Classic Auction

ESTIMATE: $275,000 - $325,000
CHASSIS NO: 0F02Z126291
• Numbers matching, original drivetrain
• One of only 43 in Grabber Green with black interior
• Concours restoration to OE specifications
• Diamond Award Winner in the Heritage Class at Mid-America Ford and Shelby Meet scoring 1,745 out of 1,775 points
• Fully documented by Marti Report, Ford factory invoices, and original Build Sheet

Kar Kraft No: KK 2302

429 cid V-8 with Holley four-barrel carburetor rated at 375 HP, four-speed manual transmission, independent front suspension via coil springs and upper and lower wishbones, live rear axle with semi-elliptic leaf springs, front disc and rear drum brakes; wheelbase 108”


There is an old expression in racing: “Win on Sunday, sell on Monday.” In the case of the Boss 429, it was the other way around. In 1969, Ford introduced a limited edition model to the Mustang line. The name referred to its 429 cid V-8 engine, and the “Boss Nine” was Ford’s answer to the Chrysler 426 cid “Hemi” which dominated NASCAR racing in the late '60s. Due to the sheer size of the engine, extreme modifications were made to the entire front end of the car which was too narrow to accommodate the massive block. Consequently, Ford contracted with Kar Kraft to develop and build the Boss 429 Mustang.

The Boss 429 engine was designed strictly for racing, and it was commonly called the “NASCAR” motor. Although based on a strengthened version of the 385 series engine, the Boss 429 featured a high nickel content, cast iron block with four bolt main bearings, forged steel connecting rods, forged pistons, and a forged crankshaft. Designed as a “free breathing” engine for sustained high RPMs, the Boss 429 was fitted with aluminum cylinder heads featuring a semi-hemispherical combustion chamber with massive intake and exhaust ports. The engine was soon christened the “Blue Crescent” in reference to the shape of the head design, and a single Holley four-barrel carburetor rated at 735 CFM was mounted on a dual plane, aluminum intake manifold. Although conservatively rated at 375 horsepower from the factory for insurance purposes, it would produce considerably more in “race tune.”

The engine was mated to a close ratio four-speed Toploader transmission with a Hurst Competition shifter, and power was sent to a 9” rear end fitted with 3.91 gears and a Traction-Lock limited slip differential. The cars were also equipped with an external oil cooler and a competition suspension just for good measure.

These rare Mustangs were only offered for two years beginning in 1969, and the only factory option was color. For the 1970 model year, the Boss 429 was slightly restyled, and total production culminated in a mere 499 cars built. This is KK 2302, and it was originally delivered to Bill Watson Ford in New Orleans, Louisiana. The car eventually found its way to New Mexico where it must have enjoyed a fairly pedestrian existence. When purchased by the current vendor 14 years ago, the rust-free car showed a mere 35,000 miles and was remarkably well-preserved, thanks in large part to the dry, arid climate. After purchasing the Boss 429, the owner commissioned a no-expense-spared restoration of the car to original factory specifications. It was sent to noted Boss 429 specialist Martin Euler in Michigan where it underwent a multi-year rotisserie restoration to exacting standards.

The interior of car is largely original including the dash and black Clarion Knit/Corinthian vinyl bucket seats. The original, numbers-matching engine was rebuilt by Dick Serdinak who is regarded as one of the top Boss 429 engine specialists in the country. Upon completion of the restoration, KK 2302 was sent to well-known Boss 429 authority, Ed Meyer, for a comprehensive visual inspection. At that time, the Boss was completely detailed to the highest concours standards, with all factory paint daubs and correct chalk inspection marks carefully applied.

When the Boss made its debut at the Mid-America Ford and Shelby Meet, it scored a remarkable 1,745 out of a possible 1,775 points to win the coveted Diamond Award in the Heritage Class, which is the highest level for restored cars.

Documentation for the car includes the Marti Report and the factory invoices from Lois Emminger verifying the car’s authenticity and confirming its original specifications. Amazingly, the original Build Sheet was found still inside the car during restoration, although it had deteriorated over time.

Simply put, this Boss 429 is a superior example of Ford’s racing prowess. It is a masterpiece of engineering featuring one of the most powerful and exotic engines of the muscle car era with a NASCAR pedigree to match. Finished in its original Grabber Green, this Boss 429 is one of only 43 cars built in this very rare and desirable color combination, making it one of the most sought-after of all the Boss 9's to come to market.

1970 Ford Mustang Boss 429
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