1965 Buick Riviera GS For Sale - No Expense Spared Complete Custom Build By Detroit Speed

LMC is very proud to offer for sale this 1965 Buick Riviera GS

Built by Detroit Speed & Engineering, one of the most respected names in high-end Pro-Touring and custom fabrication, this 1965 Buick Riviera GranSport showcases the company’s renowned attention to detail, engineering precision, and world-class craftsmanship. Every element of this build reflects Detroit Speed’s commitment to producing performance cars that drive as flawlessly as they present. Finished in Rosso Mugello Red, the Riviera retains its signature styling cues while incorporating modernized proportions, hand-fabricated bumpers, billet one-off components, and refined body lines that elevate its timeless design.

Power comes from a Mast Motorsports Black Label LSX producing approximately 730 horsepower, dressed to resemble Buick’s legendary Nailhead V8. The driveline is paired to a 6-speed automatic transmission that can be paddle shifted. Suspension is what Detroit Speed is known for, and they utilized a custom hydroformed front subframe, three-link Swivel-Link rear suspension, and JRi hydraulically adjustable coilovers, delivering exceptional handling and ride comfort. Braking is provided by carbon-ceramic rotors with Brembo calipers and Bosch ABS, all housed behind 19/20inch Forgeline wheels wrapped in Michelin performance tires.

Inside, a custom brown leather interior accented with bloodwood veneers, Classic Instruments gauges, and paddle shifters blends classic Buick elegance with contemporary refinement. Every control—from the reimagined factory sliders to the handcrafted dash—was designed for both form and function.

The cost to duplicate this build today would be well north of  $1 million, underscoring the level of design, fabrication, and engineering invested by Detroit Speed. A one-off, show-level Riviera that performs like a modern grand tourer while honoring Buick’s design heritage.Built by one of the industry’s finest, featured by Hemmings and Modern Rodding, and presented in absolute concours-level condition.  A true, must been to appreciate. Rarely do cars of this build quality and level ever come to the public market.