USA vs USA — 1970 vs 1959
| GSX Stage 1 455 | Invicta Convertible 401 | |
|---|---|---|
| Horsepower | 360 hp | 325 hp |
| Torque | 510 lb-ft | 410 lb-ft |
| Engine Size | 7,456 cc | 6,571 cc |
| 0-60 mph | 5.5 sec | 8.5 sec |
| Top Speed | 130 mph | 118 mph |
| ¼ Mile | 13.4 sec | 16.0 sec |
| Weight | 3,600 lbs | 4,350 lbs |
| Wheelbase | 2,845 mm | 3,150 mm |
| Length | 5,156 mm | 5,562 mm |
| Units Produced | 678 | — |
| Original MSRP | $3,283 | $3,515 |
| Value (Excellent) | $250,000 | $85,000 |
| Collectibility | 9/10 | 7/10 |
| Rarity | 8/10 | 7/10 |
On balance, the 1970 Buick GSX Stage 1 455 makes a stronger case on paper with more power, quicker acceleration, higher top speed. However, the 1959 Buick Invicta Convertible 401 counters with better value, and its appeal extends beyond mere numbers. Choose the 1970 Buick GSX Stage 1 455 for outright capability, or the 1959 Buick Invicta Convertible 401 for a more distinctive ownership experience.
Buick has long offered a diverse lineup, and comparing the 1970 Buick GSX Stage 1 455 with the 1959 Buick Invicta Convertible 401 highlights the breadth of the marque's engineering philosophy. The 1970 Buick GSX Stage 1 455 holds a clear advantage in raw power with 360 hp compared to 325 hp, a 35-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Buick GSX uses a V8 OHV (Buick 455 Stage 1) displacing 7,456 cc, while the Buick Invicta relies on a V8 OHV (Buick 401 Nailhead) with 6,571 cc. In the sprint to 60 mph, the 1970 Buick GSX Stage 1 455 edges ahead at 5.5 seconds versus 8.5 seconds. The Buick GSX carries a weight advantage, tipping the scales 750 lbs lighter. On the collector market, the 1970 Buick GSX Stage 1 455 commands a significant premium over the 1959 Buick Invicta Convertible 401, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1970 Buick GSX Stage 1 455 rates higher among enthusiasts and auction houses.