The 1987 Buick GNX stands as the ultimate version of the Grand National and a legendary chapter in American performance history. This specific car, identified as number 308 of the 547 units produced, has a remarkable story. It was originally delivered to a dealership in Long Beach, California, where it remained largely on display and in storage for decades. Showing only 700 miles, this GNX represents a rare opportunity to own a preserved, limited-edition icon.
The Grand National Experimental History
Buick partnered with McLaren Performance Technologies and ASC to create the Grand National Experimental. This collaboration was intended to celebrate and mark the end of the Grand National’s production run. All 547 examples were finished in signature glossy black. The GNX received unique visual and mechanical elements setting it apart from its already potent sibling.
GNX-Specific Exterior Styling
The exterior features details that immediately identify this as a true GNX. These include composite wheel arch flares giving the coupe a wider, more aggressive stance. Heat-extracting fender vents and a distinct three-piece rear spoiler were also added. Of course, the requisite GNX badging is proudly displayed. The car is said to have been refinished under prior ownership. Work in 2022 included paint correction and replacement of the bumper fillers.
Upgraded Suspension and Wheel Details
The 1987 Buick GNX chassis utilized standard Grand National front suspension components. However, the rear was significantly upgraded to manage the engine’s increased torque output. Changes included a Panhard rod, a beefier torque arm, and an additional frame cross member. These features dramatically improved rear axle stability during hard acceleration.
Wheels, Tires, and Braking System
The car sits on distinctive black-finished 16-inch cross-lace wheels. These are fitted with GNX-branded center caps. The tires are period-correct Goodyear Eagle VR50 units, though the right-front uses an Eagle ZR50. Braking capability is handled by a system featuring power-assisted front discs and rear drums. This setup was standard for the era.
Inside the Limited-Edition Cabin
The interior of the GNX is finished in a unique two-tone black and Sand Gray cloth upholstery. The front bucket seats feature the recognizable Turbo 6 embroidery on the headrests. This coupe includes several desirable factory features. These include a power-adjustable driver’s seat, air conditioning, and cruise control. The air conditioning system was serviced in 2022.
Instrumentation and Interior Details
A plaque mounted on the passenger side of the dashboard identifies this as GNX #308. The headliner and sun visors were recently reupholstered in October 2022. The three-spoke, leather-wrapped steering wheel frames a set of GNX-specific Stewart-Warner gauges. These performance-oriented instruments include a 160-mph speedometer and a tachometer. Separate gauges monitor essential readouts like boost pressure, oil pressure, and coolant temperature. The five-digit odometer currently shows a mere 700 miles.
Summary of Power, Engine Specs, and Performance
The heart of the 1987 Buick GNX is the turbocharged 3.8-liter V6 engine, heavily modified by ASC/McLaren. It features a Garrett T3 turbocharger shielded by a heat shield displaying the GNX lettering. A larger air-to-air intercooler and a low-restriction exhaust system were installed, resulting in impressive power. Factory-rated output stood at 276 horsepower and a massive 360 lb-ft of torque. Power is reliably routed through a strengthened Turbo-Hydramatic 200R4 four-speed automatic transmission. This is paired with a factory-upgraded oil cooler and a limited-slip differential with a GNX-branded aluminum cover. This combination allows the coupe to deliver truly explosive acceleration figures.
A Museum-Quality Collector 1987 Buick GNX
This well-documented 1987 Buick GNX, number 308, offers a rare combination of low mileage and mechanical soundness. Its unique history of extended storage and limited ownership adds to its collector appeal. With its powerful turbocharged V6, custom GNX performance parts, and preserved interior, this coupe stands as a highly significant piece of performance automotive heritage. The included original window sticker, owner’s manuals, and numbered book further enhance the car’s provenance.
Disclaimer: This article is for informational and entertainment purposes only. The information provided is based on market trends and personal opinions and should not be considered financial or investment advice. Readers should always conduct their own research and consult with a professional advisor before making any decisions.
Source & Details: bringatrailer.com
