1968 Buick GS400 Convertible | 455 V8, 4-Speed, Classic Muscle in PA

1968 Buick GS400 Convertible – 455 V8, 4-Speed Classic Muscle for Sale in Pennsylvania

Route 61 Classics proudly presents this 1968 Buick GS400 Convertible, a striking example of GM's late-'60s muscle heritage. Combining classic styling, convertible comfort, and serious big-block performance, this GS400 delivers the perfect balance of refinement and raw power.

Finished in Scarlet Red with a black power convertible top and matching black vinyl interior, this Buick commands attention wherever it goes. The paint shows excellent depth and gloss, complemented by bright chrome, GS badging, and a functional hood scoop that underscores its performance intent. 15-inch Magnum 500 wheels with BFG Radial T/A tires complete the car's aggressive yet elegant stance.

Power comes from a 455 cubic-inch Buick V8, believed to be from 1970–71 (casting #1238861), producing a dyno-verified 428 horsepower and 468 lb-ft of torque. Performance upgrades include a Lunati camshaft, Edelbrock aluminum intake, and Holley 4-barrel carburetor, backed by a Muncie M21 4-speed manual transmission and 10-bolt rear axle. The engine bay is highly detailed, with polished accessories that showcase the quality of the build. Dual Flowmaster exhausts with long-tube headers deliver a deep, muscular tone true to the golden era of American performance.

Inside, the GS400's black vinyl bucket seats, center console, and Hurst 4-speed shifter create a true driver's cockpit. Factory-style woodgrain trim, auxiliary gauges, and a factory tachometer add both functionality and vintage flair. All gauges, lights, and switches are clean and operational, showing careful upkeep and pride of ownership.

Underneath, the car is solid and well-maintained, featuring independent front suspension, a rear 4-link with coil springs, and power front disc brakes with rear drums. The chassis and undercoating show light patina consistent with a car that's been enjoyed, not neglected.

This 1968 Buick GS400 Convertible is a rare opportunity to own one of Buick's finest muscle-era drop-tops—combining luxury, torque, and timeless style. It's equally at home on the show field, at local cruise nights, or out on the open road.

Located in Orwigsburg, Pennsylvania, Route 61 Classics serves muscle car enthusiasts across Allentown, Reading, and Harrisburg. Contact us today to make this 455-powered GS400 Convertible yours.