Ford Mustang Boss 429 (1st generation)
The ultimate NASCAR-homologated Mustang, built to house the legendary semi-hemi 429 V8.
- Power
- 375 bhp
- 0–60 mph
- 7.1 s
- Top speed
- 118 mph
- Est. value
- $280k–$950k
About the Ford Mustang Boss 429
The Boss 429 was a homologation special created to qualify Ford's new 'semi-hemi' engine for NASCAR competition. Because the massive 7.0-litre V8 was too wide for the standard Mustang engine bay, Ford contracted Kar Kraft to extensively modify the front suspension and shock towers. Despite its conservative 375 hp factory rating, the engine was a detuned race unit capable of far more power. It is distinguished by its massive functional hood scoop, front chin spoiler, and 'Boss 429' fender decals, remaining one of the most valuable and collectible Mustangs ever produced.
Ford Mustang Boss 429 specs
The Ford Mustang Boss 429 produces 375 bhp (280 kW) and 610 Nm (450 lb-ft) of torque. It reaches 60 mph in 7.1 seconds and has a top speed of 118 mph (190 km/h).
| Make | Ford |
|---|---|
| Model | Mustang Boss 429 |
| Generation | First generation (1st generation) |
| Trim | 7.0 V8 |
| Years | 1969–1970 |
| Type | Muscle |
| Body style | Coupé |
| Country | United States |
| Production | About 1,359 built |
| Original price | About $4,900 when new |
| Engine | 7.0-litre V8 |
|---|---|
| Displacement | 7,030 cc (7.0 litres) |
| Induction | Naturally aspirated |
| Power | 375 bhp (280 kW) at 5,200 rpm |
| Torque | 610 Nm (450 lb-ft) |
| Redline | 6,000 rpm |
| 0–60 mph | 7.1 s |
| Top speed | 118 mph (190 km/h) |
| Transmission | 4-speed manual |
| Drivetrain | Rear-wheel drive |
| Weight | 1,755 kg (3,869 lb) |
| Power-to-weight | 214 bhp per tonne |
Typical figures for the standard car; options, markets and model years vary. Where our specs come from
How much is a Ford Mustang Boss 429 worth?
A typical Ford Mustang Boss 429 is estimated to be worth $280,000 – $950,000 (about £209,000 – £708,000).
Its original price when new was about $4,900.
Values are directional estimates for a typical example, not appraisals. Condition, mileage, history and specification all change what a real car is worth. Pound figures use the exchange rate of 3 November 2026. How values are estimated
Ford Mustang Boss 429 rarity in CarSpot
The Ford Mustang Boss 429 is a Unicorn card in CarSpot, with a rarity score of 100 out of 100. The rarest tier: hypercars, one-offs and cars built in tiny numbers, typically fewer than about 500. A Unicorn card is worth 320 XP.
Each model's tier starts from a 0–100 score based on its value plus its power or production numbers. Once enough players have spotted a model, how often it is spotted can move it up or down one tier. How CarSpot rarity works
Rarity is a collectible game mechanic, not an assessment of real-world scarcity or value.
Ford Mustang Boss 429 fun facts
- The engine was so large that Ford had to remove the air conditioning to make it fit, meaning no Boss 429 ever left the factory with AC.
- To accommodate the engine, Kar Kraft had to physically move the shock towers outward and modify the control arms, giving the car a unique suspension geometry.
- The 375 hp rating was widely considered a 'polite fiction' to appease insurance companies; actual output was estimated to be closer to 500 hp.
