Rumors of ringer test cars may or may not be true.Īlthough separate from the Grand National’s lineage, Buick decided to send the modern muscle car out with a bang in the form of the GNX. The Grand National’s dash was quicker than anything Chevrolet had dreamt up for the Camaro or Corvette-it was even quicker than nearly every U.S.-spec Ferrari on sale. By 1987, the darling year for the Buick Grand National, the engine made 245 hp and 355 lb-ft of torque.Ĭar and Driver mashed the accelerator in a 1986 review of the muscle car and clocked a 0-60 mph sprint in 4.9 seconds. Come 1986, the engine made 235 hp and 330 lb-ft of torque, thanks to a new two-piece aluminum intake manifold and a new intercooler.
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