1970 Buick Skylark Convertible GSX Tribute

Description

OFFERED WITHOUT RESERVE

Huntsville, Alabama — or “Rocket City,” as we know it — is home to NASA rocket-propulsion research and development. This special offering is once again a presentation of the unique, with American Muscle, British class, heavy post war iron, and race cars from multiple platforms all on offer. These cars are ready for blastoff, and all will be launched to new homes and garages as all lots are presented with NO RESERVE.

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The 1970 Buick GSX was the GM division’s bold entry into the peak of the American muscle car era. Introduced as a performance and appearance package for the Gran Sport (GS) 455, the GSX was designed to compete with the likes of the Pontiac GTO Judge and Oldsmobile 442 W-30. It was available only as a hardtop coupe and came standard with the massive 455 cubic inch V8 engine, producing 350 horsepower in base form or an underrated 360 horsepower with the optional Stage 1 package—making it one of the most powerful muscle cars of its time. The GSX stood out visually with its aggressive styling: bold striping, a rear spoiler, hood tachometer, and unique colors—only Saturn Yellow and Apollo White. Just 678 units were produced in 1970, making it a rare and highly collectible model today. While Buick was known for luxury, the GSX proved it could deliver raw performance without sacrificing refinement. But for some reason they never offered a GSX convertible, and the idea of such an open-air cruise missile has captured the imagination of builders for decades — like this Skylark ragtop that has had a four-year transformation into the Buick GSX that should have been. 

Highlights 

• Offered from The Rocket City Collection 

• Four-year comprehensive frame-off custom restoration 

• Finished in Pyrite Brown over a Faun interior 

• New white convertible top and boot 

• Rebuilt performance fuel-injected 455 Buick V-8 including: 

  • Custom Buick valve covers 

  • Edelbrock air flow series air cleaner 

  • Gold Edelbrock aluminum intake 

  • Holley Sniper fuel injection 

  • Aluminum radiator with dual electric fans 

  • Aluminum pulleys 

  • Doug’s custom headers with custom dual exhaust 

• Performance three-speed automatic transmission 

• Ram Air induction hood 

• The chassis number (444670H172290) decodes as: 

  • 4 – Buick 

  • 44 – Buick Skylark Custom 

  • 46 – Indicates a V8 engine 

  • 67 – Two-door convertible 

  • 0 – 1970 

  • H – Flint, Michigan, final assembly plant 

  • 172290 – Production Sequence Number 

Features 

• Posi-Traction rear end 

• Custom adjustable coil over suspension 

• Wilwood disc brakes 

• Power steering 

• Detailed chassis and undercarriage 

• Custom 20-inch wheels with custom Buick center caps 

• Grenlander L-Zeal 56 245/35R20 tires in front, Grenlander iLink 275/35ZR20 in rear  

• Custom Stage II GS badging  

Known Imperfections 

• This 1970 Buick Skylark GSX Convertible Custom is presented as a finely restored example and is said to be free from any substantial imperfections. 

Included 

• New custom convertible boot  

Ownership History

This 1970 Buick Skylark GSX Convertible Custom one of many collector cars that make up the ever-evolving Rocket City Collection, is offered from an established Alabama car enthusiast who enjoys the pursuit and trade of great cars in equal measure to the curation of the same.  

A previous owner stated, “This 1970 custom built two-door convertible Buick Skylark was rebuilt in honor of my brother-in-law who passed away before he was able to finish the build. While the mileage is listed at 64,000 miles, the engine is a brand new 455 (non-matching), along with a fully rebuilt body, and beautiful Pyrite Brown exterior paint. The upholstery and convertible top are all brand new in a stylish Fawn interior. The entire under carriage has been redone, including transmission, brakes, rear end, and front end.” 

Additional Notes

Please note this lot is being sold on a transferable Alabama registration only, and no title will be provided. Please reach out to ohiggins@hagerty.com should you have any questions.

A Broad Arrow Auctions Specialist is working as an agent on behalf of the owner of this vehicle. Broad Arrow Auctions is a wholly owned subsidiary of Hagerty. 

Contact: Ramsey Potts Phone: 912.508.4096‬ email: rpotts@hagerty.com