The Apex Collection · Lot F179.1
1965 Buick Riviera GS Hardtop
Detroit Speed Pro-Touring Build, 730 HP Mast Motorsports LSX V-8
Highlights
- No-expense-spared complete custom build by Detroit Speed
- Build cost in excess of $1.25 Million, complete with invoices
- SEMA show car
- 730 HP Mast Motorsports LSX V-8 disguised as a Buick Nailhead V-8
- Painted in Rosso Mugello Red
- Custom Brown leather interior
- Endless one-off billet parts including steering wheel, valve covers, interior trim and more
- Detroit Speed hydro-formed front suspension
- Detroit Speed 3-link rear suspension
- Custom metalwork including hand-fabricated bumpers
- Carbon-ceramic Brembo brakes
- Forgeline wheels with Michelin tires
- A true, one-off full custom Pro Touring car
Specification
- Year
- 1965
- Make
- Buick
- Model
- Riviera
- Exterior
- Rosso Mugello Red
- Interior
- Brown
- Transmission
- Automatic
- Odometer
- 619 miles
- Lot
- F179.1
The Story
Built by Detroit Speed & Engineering, one of the most respected names in high-end Pro Touring and custom fabrication, this 1965 Buick Riviera Gran Sport 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 HP, dressed to resemble Buick’s legendary Nailhead V-8. 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- and 20-inch Forgeline wheels wrapped in Michelin performance tires.
Inside, a custom brown leather interior accented with bloodwood veneers, Classic Instruments gauges and paddle shifters that blend 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. It’s 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 concours-level condition, it’s an impressive build that must be seen to truly appreciate.
