Description

1987 Buick GNX – 3k Miles, Turbocharged 3.8L V6, ASC/McLaren

This 1987 Buick GNX is one of just 547 examples built to commemorate the final year of the Grand National and was modified by ASC/McLaren Performance Technologies for increased performance and exclusivity. Finished in the model’s signature black exterior over a black and Sand Gray cloth interior, this example shows just 3,000 miles and is powered by a turbocharged 3.8-liter V6 paired with a Turbo-Hydramatic 200R4 four-speed automatic transmission and a limited-slip differential.

Factory enhancements include GNX-specific suspension and drivetrain modifications, Garrett T3 turbocharger, upgraded air-to-air intercooler, 16″ cross-lace GNX wheels, and composite fender flares. The GNX remains one of the most celebrated and collectible performance cars of the 1980s and is considered a cornerstone of American turbocharged muscle. This example retains its GNX-specific Stewart-Warner instrumentation, original interior, and presents in excellent condition throughout.

Key Information

• Year: 1987

• Make/Model: Buick GNX

• Engine: Turbocharged 3.8L V6 (276 hp / 360 lb-ft)

• Transmission: 4-Speed Turbo-Hydramatic 200R4 Automatic

• Drivetrain: Rear-Wheel Drive w/ Limited-Slip Differential

• Mileage: 3,000 miles

• Color: Black

• Interior: Black & Sand Gray Cloth

• Ownership: 1 Owner

• Condition: Used, Collector Quality

Exterior

Finished in its original black paint, all 547 GNXs received identical exterior treatment, which included composite wheel arch flares, heat-extracting front fender vents, a three-piece rear spoiler, GNX badging, and dual exhaust outlets. Additional equipment includes an automatic power antenna, sport mirrors, rear window defogger, and xenon-style sealed beams. The car retains its factory chrome-trimmed 16″ cross-lace alloy wheels, each with GNX center caps, mounted on BFGoodrich g-Force Sport Comp-2 tires.

Interior

Inside, the GNX features front bucket seats and a rear bench trimmed in black and Sand Gray cloth, complete with Turbo 6 headrest embroidery. The dashboard houses GNX-specific Stewart-Warner gauges, including a 160-mph speedometer, 8k-rpm tachometer, and readouts for boost, oil pressure, temperature, and fuel level. A leather-wrapped three-spoke steering wheel and Delco AM/FM/cassette stereo with a graphic equalizer round out the period-correct interior. Additional features include power windows, air conditioning, cruise control, and a power-adjustable driver’s seat. The five-digit odometer shows 2,200 miles, with approximately 240 added under current ownership.

Performance & Powertrain

Under the hood, the 3.8-liter turbocharged V6 was upgraded by ASC/McLaren with a Garrett T3 turbocharger, a larger air-to-air intercooler, and a low-restriction exhaust system, resulting in a factory-rated 276 horsepower and 360 lb-ft of torque. Additional mechanical enhancements include a factory-upgraded oil cooler, and a limited-slip differential with a GNX-branded aluminum rear cover. Power is routed to the rear wheels through a Turbo-Hydramatic 200R4 four-speed automatic transmission. A recent oil change was completed in preparation for sale.

The GNX was also fitted with revised rear suspension components including a Panhard rod, torque arm, and additional cross-member. Braking is handled by power-assisted front disc brakes and rear drums.

Summary

Representing the pinnacle of Buick’s muscle car lineage, the 1987 GNX was a send-off unlike any other, combining sinister looks with serious turbocharged performance. With just 3,000 miles, one-owner provenance, and a legacy tied to ASC/McLaren, this GNX is a collector-grade icon and one of the most desirable GM performance cars of the 1980s.

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