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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.