Lot 23
1967 Buick Gran Sport 400 Convertible


Selling on Wednesday

CHASSIS NO: 446677K122197

• 1 of 2,140 GS Convertibles produced in 1967
• Frame-off restoration
• Rebuilt 400 engine and transmission
• Highly desirable, hard to find Buick muscle car

400 cid V-8 engine, 340 HP at 440 ft-lbs torque, single carburetor, TH400 automatic transmission, four-wheel power-assisted drum brakes, independent front suspension with coil springs, live rear axle with coil springs; wheelbase: 115”

Reacting to the runaway success of the Pontiac GTO in 1964, Buick introduced the Skylark Gran Sport for the 1965 model year, following the same formula so successfully employed by Pontiac of inserting a large displacement engine into an intermediate size car. Buick engineers fitted the 401 cubic-inch “Nailhead” engine, normally used in full-sized Buicks, and the Gran Sport was born. In 1967, Buick retired the venerable Nailhead engine that had been used since 1953, introducing a completely new and modern line of engines. The new 400 cubic-inch Gran Sport engine had bigger manifold branches, larger valves, and improved exhaust headers that assured minimum gas flow restriction. Intake valves were 18 percent larger than in 1966 and the exhaust valves were 56 percent larger. Other innovations included water jackets in the cylinder heads that were carried around the spark plug holes. In addition, conical spark plug seats eliminated the need for plug washers. The 400 was rated at 340 horsepower with an impressive 440 foot-pounds of torque. Topping off the new engine was an elaborately-styled, futuristic air cleaner unique to the GS 400. In recent years, Buick aficionados affectionally refer to it as the “Star Wars” air cleaner. Compared to its 1965 Gran Sport test car, Car Life found that the 1967 GS-400 faster to 60 mph (6.6 seconds) and in the quarter mile (14.7 seconds). But there were more changes than in the engine department alone. For one, the Gran Sport wasn't a Skylark any more. As Popular Mechanics put it, "Probably feeling the 'Skylark' tag might be too much for the birds, Buick folks 'officially divorced' what is now the GS-400 from the Skylark series. They're probably right -- a ruddy young male would much prefer a masculine GS-400 to a fine-feathered bird."

Instead of fender skirts, which were standard on the Skylark, the GS had open rear wheel housings that showed off its F70 x 14 wide-oval red- or white-stripe tires. General styling was left intact, but the grille adopted a thicker horizontal bar bisected by a strong vertical spine accented in red. Taillights were enlarged a bit as well.
This rare 1967 GS Convertible has been treated to a complete, frame-off restoration starting with a dry, rust-free Montana car. Restoration included a rebuilding of the 400 cubic-inch engine and TH400 automatic transmission, as well as a rebuilding of the suspension system, including, A-arm bushings, shocks absorbers, springs, tie rod ends and ball joints. Additionally, new brakes, brake lines, fuel lines, fuel pump and carburetor, radiator, driveshaft, U-Joints and power top lines, plus a new set of BF Goodrich radial TA tires were installed to ensure this Gran Sport runs and drives as well as it looks. The rare and highly prized “Star Wars” air cleaner finishes off the detailed engine bay. Options featured on this Buick muscle car include a factory power convertible top, tilt steering column, bucket seats with power driver’s seat, consolette, power steering and brakes and Buick Road Wheels. Seldom seen and sought-after by collectors, this 1967 Buick Gran Sport presents a rare chance to acquire a very special car.