Buick Gran Sport 455 (3rd generation)
The gentleman's muscle car with a world-beating 510 lb-ft of torque.
- Power
- 350 bhp
- 0–60 mph
- 5.5 s
- Top speed
- 135 mph
- Est. value
- $32k–$110k
About the Buick Gran Sport 455
Introduced for the 1970 model year, the Buick GS 455 was the brand's response to General Motors lifting its displacement ban on intermediate cars. While rivals focused on peak horsepower, Buick prioritised low-end grunt, producing a staggering 510 lb-ft of torque—the highest of any American production car that year. It combined this raw power with a more refined, upscale interior than its Chevelle or GTO cousins, earning it a reputation as a 'gentleman's muscle car'. Despite its luxury leanings, the GS 455 was a formidable street machine, capable of sub-14 second quarter-mile times in stock form.
Buick Gran Sport 455 specs
The Buick Gran Sport 455 produces 350 bhp (261 kW) and 691 Nm (510 lb-ft) of torque. It reaches 60 mph in 5.5 seconds and has a top speed of 135 mph (218 km/h).
| Make | Buick |
|---|---|
| Model | Gran Sport 455 |
| Generation | Third Generation (3rd generation) |
| Trim | 7.5 V8 |
| Years | 1970–1972 |
| Type | Muscle |
| Body style | Coupé |
| Country | United States |
| Production | About 10,148 built |
| Original price | About $3,500 when new |
| Engine | 7.5-litre V8 |
|---|---|
| Displacement | 7,456 cc (7.5 litres) |
| Induction | Naturally aspirated |
| Power | 350 bhp (261 kW) at 4,600 rpm |
| Torque | 691 Nm (510 lb-ft) |
| Redline | 5,500 rpm |
| 0–60 mph | 5.5 s |
| Top speed | 135 mph (218 km/h) |
| Transmission | 3-speed automatic |
| Drivetrain | Rear-wheel drive |
| Weight | 1,728 kg (3,810 lb) |
| Power-to-weight | 203 bhp per tonne |
Typical figures for the standard car; options, markets and model years vary. Where our specs come from
How much is a Buick Gran Sport 455 worth?
A typical Buick Gran Sport 455 is estimated to be worth $32,000 – $110,000 (about £24,000 – £82,000).
Its original price when new was about $3,500.
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
Buick Gran Sport 455 rarity in CarSpot
The Buick Gran Sport 455 is a Rare card in CarSpot, with a rarity score of 57 out of 100. Performance cars, typically worth around £50,000 to £100,000. A Rare card is worth 40 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.
Buick Gran Sport 455 fun facts
- The 455 cubic-inch V8's torque rating of 510 lb-ft remained an American production car record for 22 years until the Dodge Viper arrived in 1992.
- Buick's 455 engine was surprisingly light for its size, weighing roughly 150 lbs less than the Chevrolet 454 big-block due to its thin-wall casting.
- The 1970 GS 455 featured functional 'Ram Air' hood scoops that were sealed to the air cleaner to force cool air directly into the carburettor.
