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1970 Buick GSX

February 18, 2017

 

Owner: Clay Edwards

Hometown: Atlanta, Georgia 

 

Description:

In 1968, Buick started production of the GS 350 using Buick’s 350 cubic inch small block engine. Sales of the GS 350 for 1970 was $9,948. The GSX Stage1 was the optional high performance package available on the GS 455 starting in 1970. The GSX ornamentation package was a $1,100 option on the GS455. The GSX was made to attract attention and to help showroom traffic in an effort to increase sales. The GSX was Buick's answer to Pontiac's GTO Judge and Oldsmobile's 4-4-2 W-30. Buick advertised it as "A Brand New Brand of Buick" and "Another "Light Your Fire Cars From Buick". It was only available with the standard big block 455 engine or the optional Stage 1 engine the first year. It was not a very popular model and not too many people bought them, and only 678 GSXs were produced in 1970. Just 278 were equipped with the standard 455, with 400 being equipped with the optional Stage 1 performance package. GSX or any GS Stage-1 performance is comparable to that of the 'Hemi' 'Cuda but is a much more luxurious car. This is partly due to the light weight of the 455 which is roughly 150 lb (68 kg) less than the Chevrolet 454. The engine's performance also relies on the tremendous torque this engine produces, 510 lb-/ft (Gross) at a low 2800 rpm.  In 1970, the GSX option was available in only two colors, Saturn Yellow and Apollo White. All GSXs had the distinctive full body length black stripe that crossed over the standard equipment rear spoiler and was outlined in red pin stripes. A large area of the hood was also black with a hood mounted tachometer (Buick engineers disliked the hood tachometer because it was a Pontiac part) and black front spoiler. Also standard equipment were black bucket seats, floor shifter, wide oval tires, quick ratio steering and anti-sway bars. Some other options were automatic transmission or four speed manual. 

The Stage 1 engine option consisted of a more aggressive camshaft, higher compression, unique cylinder heads with larger (2.13" intake and 1.755" exhaust) valves, a specially tuned 4 barrel Quadrajet carburetor, more aggressive ignition timing,5/8 inch oil pickup tube and a higher numerical final drive. The engine was available with either a firmer shifting Turbohydromatic 400 or a Muncie M-22 "rock crusher" 4 speed and a standard 3.64:1 Positraction axle ratio. Stage 1 cars equipped with air conditioning received a 3.42 axle ratio. The magic of the Stage 1, it would seem, was primarily attributable to its advanced (for the period) cylinder heads and the relatively high mid-range horsepower they produced.

 

Modifications: This was originally a GS350, 4 speed car. I recreated the GSX model with Chevrolet's "Screaming Yellow" color.and the same stripping package as original GSX model. It has 455 CID motor bored 30 over, 5 speed Tremec manual transmission, headers, MSD electronic ignition, 3.90 gear in rear end, 4 barrel Quadrajet carb,4 wheel disk brakes, 3" dual exhaust, and 10.5:1 compression ratio.

 

 

 

 

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