Classic Car Archive Specs, Facts, & History
All good things come to an end, and Buick decided to go out with a bang for its final Grand National.
New for 1987 was the GNX produced by McLaren Performance Technologies/ASC. It was created as “the Grand National to end all Grand Nationals.” Given a conservative rating of 276hp (most experts agree that number is more like 300hp) and 360 lb-ft of torque, the GNX would be the fastest Grand National ever.
The GNX received a new intercooler, a new Garrett turbo with lightweight ceramic impeller. It also received a revised rear suspension, bigger wheels, a new Stewart-Warner instrument cluster, and some minor trim changes including louvers in the front fenders.
The new car was extremely fast. 4.7 sec 0-60 and 13.5 sec @ 102 mph in the quarter-mile. It was fearful of nothing on the street except the most exotic or heavily modified cars. The entry price for speed was steep with the GNX being almost twice as much as the Grand National. As you’ll see in the Kenne Bell brochure, Grand National owners could buy performance additions for less than the GNX and surpass its performance. Sales of the GNX were limited to 547 cars. Production for the Grand National lasted 5 months longer than planned due to increased demand.
The Grand National would not be overshadowed by its faster counterpart. It too received some upgrades and now boasted 245hp and 355 lb-ft of torque. Visually, Buick freshened up the grille and made a few minor changes to the interior.
|Engine||0 to 60 MPH||Quarter Mile||Source|
|3.8L Turbocharged GNX||4.7 sec||13.5 sec @ 102 mph||Car & Driver|
|3.8L Turbocharged GNX||5.5 sec||13.4 sec @ 103 mph||Buick|
|3.8L Turbocharged Base||6.1 sec||13.9 sec @ 100 mph||Motor Trend 1987|
|Turbocharged and intercooled 3.8L V6||231ci||235 hp @ 4000||330 lb-ft @ 2400|
|GNX||276hp @ 4400||360 lb-ft @ 3000|
Ask Grand National expert Joseph Carroll