1966 Ford Mustang GT Coupe K-Code 4-Speed

Description

The Ford Mustang combined sporty styling, affordable pricing, and a wide range of performance options that forever changed the American automobile market. The Mustang created an entirely new class of vehicle, inspiring competitors across the industry and attracting buyers who wanted the excitement of a sports car with the practicality of an everyday car.

The K-Code Mustang represented the highest performance Mustang available in 1966, powered by Ford’s special 289ci High Performance "Hi-Po" V8 with a solid-lifter camshaft, stronger internal components, and a four-barrel carburetor producing 271 horsepower when new. For the 1966 model year, the Mustang received a revised grille with horizontal bars, a new side ornament design, a redesigned instrument cluster, and various trim updates that refined the appearance of what was already Ford’s best-selling car. The optional GT package further enhanced performance and appearance with fog lamps, special stripes, a quicker steering ratio, heavy-duty suspension components, and front disc brakes.

This 1966 Ford Mustang GT K-Code is said to have been built for Ford's Los Angeles District Sales Office and reportedly spent its first 20 years in Arizona before being moved to and ultimately stored in Minnesota, where it was acquired by the seller in 2018. Following their acquisition, the seller embarked on a multi-year restoration that included a refinish to its factory Signal Flare Red over a black Pony Package interior with bucket front seats and a center console.

Under the hood is the numbers-matching K-Code Hi-Po 289ci V8 mated to a four-speed manual transmission. The car is equipped with GT package features including fog lights mounted in the grille, Rally Pac gauges, striping, a quick-ratio steering box, and more as described below and shown in the gallery. Additionally, factory-style assembly markings and paint daubs were applied during the restoration.

The seller reports that the restoration was finished earlier in 2026, and the car has seen limited use since.

This 1966 Ford Mustang GT K-Code is now offered with restoration documents and a clean Tennessee title in the seller’s name.

Highlights

• Numbers-matching K-Code 289ci V8

• Four-speed manual transmission

• Dual exhaust system with chrome exhaust tips

• Pony Package interior

• GT Package equipment

Equipment

• The chassis number (6R07K220531) decodes as:

  • 6 - 1966 model year

  • R - San Jose, California assembly plant

  • 07 - Hardtop coupe body style

  • K - 289ci High Performance V8 ("Hi-Po")

  • 220531 - Sequential production number

• The door tag decodes as:

  • Body: 65B Mustang hardtop with luxury interior

  • Color: 5 - Signal Flare Red exterior paint

  • Trim: 66 - Black vinyl standard interior

  • Date: 22G - July 22, 1966 scheduled build date

  • DSO: 71 - Los Angeles District Sales Office

  • Axle: 6 - 2.80:1 rear axle ratio, standard differential

  • Trans: 5 - 4-speed manual transmission

• Powertrain:

  • K-Code 289ci V8

    • Block stamping 6R07K220561 corresponds with the car's serial number

  • Four-speed manual transmission

    • Case stamping 6R07K220561 corresponds with the car's serial number

  • Chrome air cleaner assembly

  • Four-barrel Autolite carburetor

  • High-performance solid-lifter camshaft

  • Performance-tuned ignition system with dual-point distributor

  • Heavy-duty radiator

  • 9-inch rear axle

• Exterior and Interior:

  • Mustang GT wheels, badging, and fog lamps

  • Backup lights and emergency flashers

  • Variable-speed windshield wipers

  • Front bucket seats wearing Pony covers

  • Rally Pac instrumentation (tachometer and clock)

  • AM radio

  • Heater and defroster

  • Center console

  • Front seat belts

• Chassis:

  • Heavy-duty suspension package

  • Front stabilizer bar

  • Dual master cylinder braking system

Known Imperfections

• Images detailing the condition of this Ford Mustang are presented in the gallery

Ownership History

The seller acquired this Mustang out of Minnesota in 2018 and subsequently embarked on an eight-year overhaul to its current condition. Numerous photos provided in the gallery show the restoration in progress.

Included Items

• Various historical documents

• Photos showing the restoration

Additional Information

The seller states, "This car was built in the San Jose, California, plant. It was professionally restored to factory specifications with all the correct inspection and quality control paint daubs and pencil markings. Dismantled and put back together with correct date code parts original to the car. No flaws known. Restored like new. "The odometer was replaced in 1986 in Phoenix, Arizona. It was then drove to Minnesota and a little while in Minnesota. It was parked in 1989 in a conditioned space and not moved until I bought it in 2018. It sat for 29 years. "This car is ready for inspection by the Mustang Club of America to be registered as Concours."

A reproduction trim tag has been riveted to the driver's door.