This 1987 Buick GNX is #480 of 547 produced for the single model year and shows only 8.5 miles. Ralph’s Buick in Mena, Arkansas originally sold the car in 1987, and it was subsequently displayed in the showroom of a Texas dealership. The vehicle has not been driven since. The seller acquired this GNX in 2002 and has reportedly stored it in a climate-controlled showroom. The Grand National Experimental was made in partnership with McLaren Performance Technologies/ASC and features an upgraded powertrain, suspension, and instrumentation. The turbocharged 3.8-liter V6 is mated to a 4-speed automatic transmission, and the two-tone cloth interior on this example retains factory protective plastic coverings. The sale includes the original window sticker, factory owner’s manual and warranty booklet, and a clean Wisconsin title in the seller’s name.

The black finish has been detailed, and factory GNX badging is limited to the front grille and trunk. The fenders were equipped from the factory with vents instead of the Grand National emblems.

16″ aluminum alloy wheels are mounted with Goodyear Eagle VR50 tires, which the seller states are original to the car. The GNX-branded center caps were never fitted and are included in the sale.

The original protective plastic remains on the front seats and door panels. The interior is trimmed in two-tone black and grey cloth, with matching black carpeting and embroidered logos on the headrests. The floor mats are stored in the trunk and are embroidered with the name of the original selling dealer.

The GNX was fitted with a revised instrument cluster of Stewart Warner analogue gauges, including the turbo boost gauge. A plaque mounted to the passenger side of the dashboard shows that this is #480 of the 547 GNX models produced.

Protective plastic is retained on the face of the instrument cluster, and the 5-digit odometer shows only 8.5 miles. The seller has not added any miles in 17 years of ownership.

McLaren Performance Technologies/ASC was involved in upgrading the standard Grand National powertrain. The 3.8-liter V6 is quipped with a Garrett T3 turbocharger, larger intercooler, and a low-restriction exhaust to produce a rumored 300 horsepower when new. The Hydramatic 200-4R 4-speed transmission also received a larger oil cooler. All together, the factory upgrades gave the GNX a 1/4 mile time of 12.7 seconds at 113.1 mph. The seller states that the only replacement parts are the battery and a relay switch, though both of the removed original items are included in the sale.

The GNX also received a Panhard bar mounted to the single model year differential cover.

The original window sticker lists the original specification, as well as an MSRP of $29,290.