The 1970 Pontiac GTO Convertible stands as a definitive marker for the end of the unrestricted muscle car era. This specific car is an elite survivor, representing one of only 241 units built with the 455 CI V-8 and automatic transmission. For decades, GM limited intermediate car engines to 400 cubic inches, but 1970 saw that ceiling finally shatter. This Atoll Blue Poly example benefited from that corporate shift, receiving the largest engine Pontiac offered. It features a power-operated black convertible top that transforms its silhouette for open-air cruising. Because it remains a matching-numbers vehicle, its historical value is exceptionally high for serious collectors. This GTO is set to be a major highlight at the Kissimmee 2026 auction this January. It serves as a rare opportunity to acquire a pinnacle-year muscle car with documented exclusivity.
Rare Atoll Blue Finish and Exterior Refinement
The exterior of this 1970 Pontiac GTO Convertible has been professionally refinished in its original Atoll Blue Poly. This shade is one of the most sought-after colors for the 1970 model year due to its vibrant metallic depth. Every piece of chrome and stainless trim has been meticulously detailed to meet show-quality standards. The Endura front bumper, a signature GTO trait, sits flush and color-matched to the rest of the body. It rides on classic Rally II wheels which are mounted with Uniroyal Tiger Paw white outline letter tires. These period-correct tires provide the perfect stance for a high-performance Pontiac from the Nixon era. A black power-operated top offers a sharp contrast to the blue paint when the weather turns. This combination ensures the car looks as fast as it actually is when parked.
Factory Interior and Driver Focused Options
The interior of this GTO remains faithful to its factory specifications with a deep black theme throughout. It features the optional center console which houses the floor-mounted shifter for the TH400 transmission. Drivers will appreciate the factory tachometer integrated into the dash for precise engine monitoring. The cabin also retains its original-style Delco AM/FM pushbutton radio for an authentic vintage atmosphere. Power steering and power brakes make this heavy-hitting muscle car surprisingly easy to manage on the road. Woodgrain accents on the dashboard add a touch of executive class that Pontiac was known for in the early seventies. Bucket seats provide the necessary support during the high-torque acceleration this car is capable of delivering. Every switch and gauge reflects the high level of care this restoration received.
Rebuilt 455 V-8 Power and Performance Specs
The heart of this 1970 Pontiac GTO Convertible is its matching-numbers 455 CI V-8 engine. This massive powerplant was factory rated at 360 horsepower but, more importantly, it produced an incredible 500 lb-ft of torque. Both the engine and the Turbo Hydra-Matic 400 three-speed transmission have been fully rebuilt to ensure peak performance. To handle this immense output, the car was equipped with a special-order 12-bolt 3.31 ratio Safe-T-Track limited-slip rear end. This driveline was specifically engineered by Pontiac to manage the extra strain of the long-stroke 455 engine. Independent front suspension and a heavy-duty rear setup provide a balanced ride quality typical of the A-body platform. With its dual exhaust system, the car produces the signature low-frequency rumble that GTO enthusiasts crave. This mechanical setup makes it a formidable performer even by modern standards.
1970 Pontiac GTO Convertible Summary
This 1970 Pontiac GTO Convertible is a blue-chip investment for any muscle car enthusiast. Its rarity as one of 241 produced with this specific driveline cannot be overstated by collectors. The combination of Atoll Blue paint and the 455 torque monster engine creates an irresistible package. Having PHS documentation further solidifies its provenance and ensures every option is factory-verified. It represents the final year before compression ratios began to drop across the American automotive industry. This car has been preserved and restored to honor its status as a top-tier performance icon. It remains a powerful symbol of Pontiac’s “Great One” legacy during its most potent year. Any collector looking for a turnkey, high-specification convertible will find this example to be an ideal choice.
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Source: mecum.com
