While the mid-sized GS 455 was enough for some, for others it was too sedate, so Buick launched the fearsome 1970 GSX. This car had all the power of the regular GS 455, but had improved suspension and more dynamic looks, with Magnum 500 wheels, spoilers, scoops and stripes. The suspension used independent wishbones at the front and coil springs out back (all uprated), but anti-roll bars at both ends improved cornering while 11-inch (279mm) discs and finned rear drums upgraded the brakes. While the 455ci (7.5-liter) was the biggest engine Buick produced, and standard in the base GSX, the majority of buyers went for the Stage 1 option, which had a four-barrel Quadrajet carb, high-lift camshaft, larger valves and a 10.5:1 compression ratio. With a true rating of 400bhp (298kW) and massive torque of over 500lb ft (677Nm), it was one of the most powerful in the muscle-car era.
Buick GSX Specifications
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