The introduction of the Buick Regal Grand National and Buick GNX we all know and love ended the disappointing performance that had accompanied the Regal Grand National appearance package of earlier years. The GN now came in all-black dress, with chrome wheels, black and gray cloth interior with the stylized Buick 6 logo embroidered in the headrests. The new Grand National made the turbocharged 3.8-liter V6 standard, adding sequential fuel injection and computer-controlled ignition. The hood grew a bulge to accommodate the new hardware. Output grew to 200 horsepower – yes, we know, your riding mower has more than that. Keep in mind, the 1984 Corvette was only laying down 205 ponies.
Grand National performance improved over its 1984-1987 production run. For the Grand National’s final year in 1987, Buick wanted to make a statement. Working in conjunction with ASC/McLaren, they built the Grand National into a street beast in black sheep’s clothing, the Buick GNX (Grand National Experimental).
From the outside, a Buick GNX looks much like a standard Grand National. Upon closer inspection, the differences become more evident. 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 interior featured a serial number plate that was mounted on the passenger side of the dash. Standard gauges were swapped for Stewart-Warner units, with gauges for oil pressure, coolant temp, and boost level housed in a modified cluster.
Even more changes had taken place beneath the hood. The Buick GNX had freer flowing heads, improved engine management controls, 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, and an improved rear suspension design with stiffer springs and stabilizer. The performance improvement was undeniable. The Buick GNX laid down a zero-to-60 time of 4.6 seconds, and shot through the quarter mile in the low 13-second range. All this was enough to best GM’s flagship Corvette.
Only 547 Buick GNXs were built by ASC/McLaren. This copy, number 480, is new in the plastic wrappers, having covered just 8.7 miles from new. It was never prepped for delivery. It has been stored in a climate-controlled display its entire life. The window sticker, books, point-of-sale materials, odometer statement, and delivery forms will be included in the sale. This Brand new GNX will be offered at the Barrett-Jackson Las Vegas event June 17th-19th.