The Buick Regal Grand National as we know it was produced from 1984 to 1987. As the mid-size rear-wheel-drive platform was coming to its end, Buick wanted to send the Grand National off with a bang. Working with ASC/McLaren Performance Technologies, they created the King of the Grand Nationals, the 1987 Buick GNX (Grand National Experimental).
The Buick GNX wore the same sinister gloss black exterior as the Grand National, but a number of exterior details set it apart from its more mundane stablemate. Composite fender flares, functional fender vents over the front tires helped cool the engine compartment, larger basket-weave 16-inch black wheels with polished aluminum lips, and GNX badges appeared in the grille, trunk lid, and on the wheel center caps.
The Buick GNX had freer flowing heads, improved engine management, less restrictive exhaust and an upgraded turbo, all combined to boost output to 276 horsepower and 360 pound-feet of torque. In addition to the engine mods, there was a transmission cooler, stiffer body, an improved rear suspension design with stiffer springs and stabilizer. A bulge was added to the hood to accommodate the increased dimensions of all the performance goodies. The improvement was undeniable. The Buick GNX laid down a zero-to-60 time of 4.6 seconds, and rocketed through the quarter-mile in the low 13-second range.
The interior of the Buick GNX featured a number of unique details. A serial number plate was mounted on the passenger side of the dash, and standard gauges were swapped for Stewart-Warner units, with gauges for oil pressure, coolant temp, and boost level housed in a modified cluster.
Our feature Buick GNX is number 308 of the 547 produced. It was previously listed on Bring a Trailer in January of 2020, when it was bid to $150,000, but failed to meet reserve. Showing just 203 miles on the odometer, it is equipped with air conditioning, cruise control, Delco AM/FM/cassette with graphic equalizer, Concert Sound II speakers, power windows, power locks, power steering, power brakes, and tilt steering. It should be noted that the headliner is sagging, and the listing indicates the car was refinished under previous ownership. The selling dealer has replaced the bumper fillers and performed paint correction.
This extraordinarily low mileage Buick GNX is now for sale on Bring a Trailer. Included in the sale is the manufacturer literature, original window sticker, Manufacturer Statement of Origin, and a clean Carfax report.