USA vs USA — 1987 vs 1959
| Regal GNX | Invicta Convertible 401 | |
|---|---|---|
| Horsepower | 276 hp | 325 hp |
| Torque | 360 lb-ft | 410 lb-ft |
| Engine Size | 3,791 cc | 6,571 cc |
| 0-60 mph | 4.7 sec | 8.5 sec |
| Top Speed | 124 mph | 118 mph |
| ¼ Mile | 13.5 sec | 16.0 sec |
| Weight | 3,640 lbs | 4,350 lbs |
| Wheelbase | 2,769 mm | 3,150 mm |
| Length | 5,023 mm | 5,562 mm |
| Units Produced | 547 | — |
| Original MSRP | $29,290 | $3,515 |
| Value (Excellent) | $275,000 | $85,000 |
| Collectibility | 10/10 | 7/10 |
| Rarity | 10/10 | 7/10 |
The 1987 Buick Regal GNX 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, better value 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.
The 1987 Buick Regal GNX and 1959 Buick Invicta Convertible 401 share a manufacturer in Buick, but that's where the similarities get interesting. These two models reveal the versatility and ambition of the Buick brand. The 1959 Buick Invicta Convertible 401 holds a clear advantage in raw power with 325 hp compared to 276 hp, a 49-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Buick Regal uses a V6 Turbo 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 1987 Buick Regal GNX edges ahead at 4.7 seconds versus 8.5 seconds. The Buick Regal carries a weight advantage, tipping the scales 710 lbs lighter. On the collector market, the 1987 Buick Regal GNX commands a significant premium over the 1959 Buick Invicta Convertible 401, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1987 Buick Regal GNX rates higher among enthusiasts and auction houses.