The 1958 Pontiac Bonneville Convertible represents a high-water mark for mid-century American automotive design and exclusivity. This specific model belongs to a unique one-year-only generation that introduced the sophisticated X-frame chassis. Finished in deep Black paint, the car serves as a rolling testament to the chrome-heavy aesthetics of the late fifties. It was masterfully restored by Pontiac Restoration Inc. in Florida, with work completed in the summer of 1987. Since then, it has secured prestigious AACA Grand National and National First Senior prizes for its quality. Only 3,096 of these limited-edition convertibles were ever manufactured by the factory in 1958. Consequently, finding an example with such a high level of decorative and mechanical pedigree is exceptionally rare today. It remains a definitive centerpiece for any serious private collection or automotive museum.
Tri Power Performance and Engine Specifications
At the heart of this 1958 Pontiac Bonneville Convertible lies a 370 cubic-inch V-8 engine. This powerplant is equipped with the legendary Tri-Power setup, utilizing three two-barrel carburetors for maximum output. It delivers the smooth and authoritative torque that defined the brand’s performance image during the period. An automatic transmission manages the power, providing a seamless driving experience for open-air cruising on the highway. Dual exhaust outlets ensure the V-8 retains its signature deep and resonant acoustic character under acceleration. Furthermore, power steering and power brakes make this heavy convertible surprisingly easy to handle in modern traffic. Every component under the hood has been detailed to meet the highest judging standards for authenticity. It is a mechanically sound example of Pontiac engineering excellence.
Jet Age Styling and Rare Exterior Appointments
The exterior of the 1958 Pontiac Bonneville Convertible is defined by its Jet Age-inspired side moldings and quad headlamps. A wraparound windshield offers excellent visibility while emphasizing the car’s sleek and futuristic profile for the era. The Black exterior paint is complemented by red steel wheels wearing full-size covers and period-correct whitewall tires. A power-operated convertible top allows for immediate transitions, while a matching boot cover maintains a clean look when down. Rare features like the driver-side spotlight add an extra layer of period-specific charm to the overall presentation. Every piece of brightwork has been polished to a mirror finish to accent the dark primary paint. This aesthetic combination remains one of the most desirable for high-end fifties cruisers.
Luxurious Interior with Period Correct Accessories
Inside the 1958 Pontiac Bonneville Convertible, the cabin features a vibrant two-tone Red and White leather upholstery. A power-adjustable split-folding bench seat provides a tailored driving position for modern enthusiasts on longer journeys. The dashboard is home to the famous Wonderbar signal-seeking pushbutton radio for authentic period entertainment. Unique accessories such as the factory-style tissue dispenser reflect the luxury focus of the top-tier Bonneville line. Power windows offer a level of convenience that was considered highly advanced for the late 1950s market. The interior retains a fresh and crisp appearance, showing very little wear since its award-winning restoration was finalized. It provides a luxurious environment that feels as special today as it did nearly seventy years ago. This cabin is a masterpiece of classic Americana.
Power Output and Technical Build Data
This 1958 Pontiac Bonneville Convertible utilizes a high-performance 370 CI V-8 engine with a Triple-Power carburetor configuration. This motor works in tandem with an automatic transmission and an all-new X-frame chassis with coil springs. The car features power-assisted steering and brakes to manage its substantial curb weight with modern reliability. Dual exhaust pipes improve the engine’s breathing while providing a classic soundtrack for the 15,099 miles shown. The electrical systems, including the power windows and top, have been maintained to ensure consistent functional performance at shows. These specifications highlight why the Bonneville was the premier choice for luxury-minded performance buyers in 1958. It remains a very fast and capable road machine for vintage tours.
Summary of the Bonneville Award History
The 1958 Pontiac Bonneville Convertible is a triple-crown winner that captures a specific moment in American history. Its combination of a Tri-Power engine and an award-winning restoration makes it an incredibly safe investment for enthusiasts. The limited production numbers ensure that its value remains stable as other models fluctuate in the market. While the restoration is several decades old, the AACA Grand National status proves the quality of the workmanship. It provides a rare opportunity to own a car that has already been vetted by the highest judges. This Bonneville is ready to continue its legacy as a show-stopping icon of the Jet Age. It is a truly remarkable piece of engineering that deserves its place in the spotlight.
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Source: mecum.com
