The Buick GSX and GSX Stage 1 bowed for the 1970 model year as a performance and handling package on the GS455. The GSX was the Buick version of the Pontiac GTO Judge or the Olds 442 W-30.
The Buick GSX came equipped with a Ram Air-fed 455 cubic-inch V8, producing 350 horsepower in standard trim or 360 horsepower in Stage 1 trim, a staggering 510 pound-feet of torque, and backed by either a three-speed automatic or four-speed manual transmission.
The Buick GSX option came with a special graphics package that included hood and side panel stripes, a front spoiler, a rear spoiler, sport mirrors, and a unique hood tach (not from the Pontiac GTO parts bin, but one specifically for the Buick). It also featured special emblems on the grille and dash pad, a special padded steering wheel, and a more robust trunk tension bar to accommodate the added weight of the trunk spoiler. Only 678 Buick GSXs were built in 1970, 187 in Apollo White and 491 in Saturn Yellow.
The Buick GSX was one of the better-equipped muscle cars, with a full host of high-performance features. Included with the GSX were black bucket seats, a floor shifter, front and rear sway bars, quad-link rear suspension, a limited-slip rear diff, quick-ratio steering, and Firestone Wide Oval tires. Air conditioning was available as a dealer-installed option.
Our feature 1970 Buick GSX is one of the 491 produced in Saturn Yellow. The exterior finish presents quite well, particularly when you consider it is largely the factory finish. Some touch-up is noted on the rear spoiler at the GSX decal. The chrome bumpers, stainless trim, and Buick SS wheels are brilliant and well polished. The wheels wear Goodyear Eagle ST radial rubber.
Inside, the Buick GSX retains most of its factory black vinyl trim. The bucket seats show little sign of wear, with some light creasing present. Woodgrain on the passenger-side dash and console is still handsome, but there is crazing noted on the driver’s side control panel. The black dash top is free from fading, curling, or cracks. Dealer-installed air conditioning is mounted beneath the passenger-side dash. This GSX is equipped with power steering and power brakes.
The engine bay of the Buick GSX is home to the 455 cubic-inch V8 fed by the Ram Air induction hood. The engine bay could stand a bit of detailing, and there is some light surface corrosion noted on the radiator cover. Though not noted in the description as such, the air cleaner cover is emblazoned with a STAGE 1 decal. A three-speed Hydramatic automatic transmission backs the 455.
This rare Buick GSX muscle car is headed to the Mecum Auctions Chicago event taking place October 21st-23rd.