GM's midsize lineup got new bodies, and two-door models got a shorter 112-inch wheelbase for 1968. That meant big styling changes for the muscle car contingent, including the 1968 Buick GS 400.

Muscle Car Image Gallery

1968 Buick GS 400
©2007 Publications International, Ltd.
Buick's midsize two-doors and their GS 400 performance iteration shed
sedan proportions for the fashionable long-hood, short-deck look in '68. See more muscle car pictures.

Buick gave its entry the long-hood, short-deck look that defined performance, but the aft flanks now looked quite massive. In fact, the new GS 400 weighed slightly more than the old, despite losing three inches of wheelbase and 4.4 inches of overall length.

1968 Buick GS 400
©2007 Publications International, Ltd.
GS 400s came with these chrome-plated wheel covers
and simulated fender air extractors.

That meant little change in acceleration, since powertrain choices were unaltered. And the trimmer size didn't seem to translate into stellar road manners; some testers said it plowed through turns worse than the '67 model. Finally, the dashboard retained an unsporting horizontal-sweep speedometer flanked by idiot lights.

1968 Buick GS 400
©2007 Publications International, Ltd.
Bucket seats, center console, and automatic transmission with
stirrup shifter were optional sporty touches, but Buick kept the
dashboard design quite conservative.

But what do the critics know? The public liked the new GS 400, and sales held steady despite more and stronger rivals from within GM and without. To Buick's credit, it kept price increases modest, assembly quality high, and its upscale image intact.

"Priced and powered in line with its competition...the GS 400 is the most luxurious of the lot, yet takes a back seat to none in performance," maintained Car Life magazine.

Offered as a hardtop coupe and convertible, the GS 400 benefited from a standard 400-cid four-barrel that delivered strong seat-of-the-pants performance without the peakiness and fussiness of most high-output engines. Transmission alternatives to the standard three-speed were a four-speed manual or three-speed automatic. Positraction, front disc brakes, and power steering were options.

1968 Buick GS 400
©2007 Publications International, Ltd.
The standard 340-bhp 400-cid V-8 was strong on midrange torque
and performed without the peakiness typical of most hot engines.

To those who wanted more, Buick offered a dealer-installed package that imbued the engine with a hotter cam, 11.0:1 compression, and stronger valve springs, and gave the transmission high-upshift modifications. Despite a 345-bhp rating, it added an estimated 50 bhp to the base 340-bhp mill and cut quarter-mile times by a second or more. The name of this rare dealer-installed option was a portent of great things to come from Buick. It was called the "Stage 1 Special Package."

The 1968 Buick GS 400
Specifications
Wheelbase, inches: 112.0
Weight, lbs: 3,415
Number built: 13,197
Base price: $3,127

Standard Engine
Type: ohv V-8
Displacement, cid: 400
Fuel system: 1 x 4bbl.
Compression ratio: 10.25:1
Horsepower @ rpm: 340 @ 5000
Torque @ rpm: 440 @ 3200

Representative Performance
0-60 mph, sec: 6.8
1/4 mile, sec. @ mph: 15.2 @ 92

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For more cool information on muscle cars, see:
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  • NASCAR race cars embody the muscle car philosophy of power. Read How NASCAR Race Cars Work to find out what makes these charged-up racers go.
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