The Buick Regal Grand National as we know it was produced from 1984 to 1987, the Grand National being little more than an appearance package prior to 1984. As the mid-size rear-wheel-drive platform was nearing its end, Buick wanted to send the Grand National off with a bang. Working with ASC/McLaren (yes, that McLaren), they created the King of the Grand Nationals, the 1987 Buick GNX (Grand National Experimental).
From the outside, a Buick GNX doesn’t look radically different from a standard Grand National. However, the GNX had plenty of secret sauce added to its mix. Heads that flowed more freely, 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. The Buick GNX laid down a zero-to-60 time of 4.6 seconds, and continued on through the quarter mile in the low 13-second range. Pretty heady stuff in 1987, crushing that year’s Corvette times.
The Buick GNX received a transmission oil cooler, and composite fender flares. The body of the GNX was stiffer than the stock Grand National, the rear suspension design was improved, springs and stabilizer bars were stiffer. The Buick GNX was equipped with larger basket-weave 16-inch black wheels with polished aluminum lips. Gauges were changed out for Stewart-Warner analog units, with oil pressure, coolant temp, and boost level gauges included in a modified cluster. Function louvers were added to the front fenders, helping hot air to escape the engine bay. GNX badges appeared in the grille, trunk lid, and on the wheel center caps. Each Buick GNX had a serial number plate that was mounted on the passenger side of the dash.
Only 547 Buick GNXs were ever built. The example we see here is #22. It has covered only 7,675 miles from new. It is accompanied by all the original Point of Sale documentation, as well as the original window sticker, dealer invoice, dealer service manual, owner’s manual, cassette radio, wheels and tires. It comes with a GNX jacket that has never been worn, other assorted apparel, literature, and spare parts. This one is headed to the Barrett-Jackson Scottsdale auction in March.