1973 Buick Riviera GS Stage One

VIN 4Y87W3H520813

event_available Jul 10, 2025
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What’s special about this listing

**For Sale: 1973 Buick Riviera GS Stage 1 – 1 of 252 GS Suspension Cars Built**

Big Blocks are rare!

Up for your consideration is a stunning **1973 Buick GS Riviera Stage 1**, an exceptional example of Buick’s bold muscle-luxury era. With **82,000 original miles** on the drivetrain, this rare beauty features the **original numbers-matching 455 Stage 1 engine (XA code)** and **Turbo 400 transmission**, both freshly rebuilt to bring out the best in Buick performance. A rare **W-code VIN** confirms its authentic Stage 1 pedigree, and it's paired with a rebuilt **original carburetor** and a tight **3.23 12-bolt posi rear end**—this car **leaks nothing** and runs strong.

Out of just **1,234 Stage 1 Rivieras** produced in 1973, this car is **1 of only 252 equipped with the GS suspension package**, making it a truly special piece of American automotive history.

### Highlights:
- **455 Stage 1 engine** (XA block code) - rebuilt
- **TH400 transmission** - rebuilt
- **Original carburetor** - professionally rebuilt
- **3.23 posi 12-bolt rear**
- **Power steering, power disc brakes, tilt steering, A/C, cruise control**
- **AM/FM/8-track stereo, rear window defroster, dual exhaust with stock mufflers**
- **Brand new tires**
- **Dent-free rocker trim and like-new chrome on both sides**

The car underwent a **professional, bare-metal restoration**, using only premium products. It was finished in **basecoat/clearcoat**, then **color-sanded, buffed, and polished** to a deep, mirror-like shine. Brake system has been fully overhauled—**new master cylinder, booster, rotors, pads, hoses, wheel cylinders**, and fluid. **New shocks all around**, including **rear air shocks** for that classic ride height.

### Interior:
The cabin is beautifully restored, featuring **new, correct black vinyl seat covers** stretched to factory spec. **Headliner and carpet are in excellent condition**, and the **dash pad is crack-free**. All **interior and exterior lights work**, including **dash lights, license plate light, and power windows**. Even the **trunk light works**. The **heater core was replaced** and provides plenty of warmth. **All A/C components are present**, though not currently restored.

### Trunk & Undercarriage:
The **trunk is spotless and finished**, with new trunk carpet, **Buick rubber mat**, **spare tire**, **jack**, and **original filler panels**. Underneath, the car is **undercoated** and extremely clean. The **rear end is detailed in gloss black** with the **factory rear sway bar intact**.

### Bonus Items:
- **Original owner manuals and factory pamphlets**
- **Spare parts included**: air pump, window motors, rear bumper with tail light lenses, spare rear window

The chrome throughout is in **amazing condition** for its age—a true testament to a life spent largely indoors and cared for by passionate owners.

If you’re looking for a collector-grade Stage 1 Riviera with documented rarity, fresh mechanicals, and no hidden needs—**this is the one**.

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**Serious inquiries only.** Feel free to email with any questions—happy to provide additional photos or details upon request.

Specs

Details about this vehicle - decoded from the VIN & CLASSIC.COM curators.

Year
1973
Make
Buick
Model Family
Riviera
Model Generation
3rd Gen
Model Variant
GS
Model Trim
Stage One
VIN
4Y87W3H520813
Mileage
82,000 mi TMU
Originality
Original & Highly Original
Engine
455ci V8 (7.5L)
Transmission
Automatic
Drive Type
Rear Wheel Drive (RWD)
Vehicle Type
Automobile
Body Style
Coupe
Driver Side
LHD
Doors
2 Doors
Color Group (Ext)
Blue
Color Group (Int)
Black

Vehicle History

A timeline of events that we've detected for this vehicle.

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