USA vs USA — 1976 vs 1959
| Regal Grand National | Invicta Convertible 401 | |
|---|---|---|
| Horsepower | 245 hp | 325 hp |
| Torque | 355 lb-ft | 410 lb-ft |
| Engine Size | 3,791 cc | 6,571 cc |
| 0-60 mph | 5.5 sec | 8.5 sec |
| Top Speed | 125 mph | 118 mph |
| ¼ Mile | 13.9 sec | 16.0 sec |
| Weight | 3,476 lbs | 4,350 lbs |
| Wheelbase | 2,743 mm | 3,150 mm |
| Length | 5,067 mm | 5,562 mm |
| Units Produced | 20,193 | — |
| Original MSRP | $16,608 | $3,515 |
| Value (Excellent) | $75,000 | $85,000 |
| Collectibility | 9/10 | 7/10 |
| Rarity | 7/10 | 7/10 |
The 1976 Buick Regal Grand National holds an edge across most measurable criteria, offering quicker acceleration, higher top speed, lighter weight. That said, the 1959 Buick Invicta Convertible 401 brings more power and remains a compelling choice for enthusiasts who value Buick heritage. The right pick depends on whether you prioritize specifications or the intangible qualities that make a car truly special.
Within the Buick stable, the 1976 Buick Regal Grand National and 1959 Buick Invicta Convertible 401 represent different approaches to performance and purpose. Both carry the Buick badge, yet each carves out its own distinct identity. The 1959 Buick Invicta Convertible 401 holds a clear advantage in raw power with 325 hp compared to 245 hp, a 80-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Buick Regal uses a V6 Turbocharged displacing 3,791 cc, while the Buick Invicta relies on a V8 OHV (Buick 401 Nailhead) with 6,571 cc. In the sprint to 60 mph, the 1976 Buick Regal Grand National edges ahead at 5.5 seconds versus 8.5 seconds. The Buick Regal carries a weight advantage, tipping the scales 874 lbs lighter. Both trade at comparable values on the collector market, making the choice between them largely one of personal preference. From a collectibility standpoint, the 1976 Buick Regal Grand National rates higher among enthusiasts and auction houses.