Muscle Car Drive

1970 Buick GS 455

1970 buick GSX

The 1970 Buick GS represents the pinnacle of Buick performance during the muscle car era. Since General Motors lifted the ban on greater than 400cid engines in mid size models Buick was quick to build a 455 cid version in the Gran Sport line.

The 455 cid engine featured bigger valves, hotter cam, more displacement, and a functional cold air system that produced an absolutely stump pulling 510 ft/lbs of torque. For the buyer looking for even more power there was the Stage 1 option. Though Buick claimed the Stage 1 system was only good for 10 hp, quarter mile times for Stage 1 Buicks were nearly a half second better than the standard GS 455 cid. A Stage 1 engine featured special ported heads with larger valves and revised valve springs, a hotter camshaft, and a tweaked carburetor. These improvements along with a 3.64:1 geared positraction made for nearly endless burnouts. With sticky tires a Stage 1 Buick was capable of low 13 second quarter mile times.

The GSX was first offered in 1970 and was essentially a trim package that included hood tachometer, Saturn Yellow or Apollo White paint, low profile spoiler, unique black striping and blacked out hood treatment, black bucket seats, floor shifter (Hurst for the four speeds) disc brakes, wide oval tires, quick ratio steering and upgraded suspension.



1970 GSX interior




At the heart of GS 455 and GSX was a new 455 cubic inch V-8. Horsepower was rated at 350 or 360hp for the Stage 1.

1970 buick 455 stage 1 engine

Production / Performance

GS 455 - 8,710 hardtops and 1,416 convertibles. GSX production was limited to 678. Quarter mile performance for a Stage 1 was 13.4 seconds at 103mph.


1969 Buick GS Top

1970 Buick GS Pictures

1970 buick gsx ad

1970 Buick GS convertible

1970 Buick GS

1970 Buick GS 455 motor

Recommended links: