USA vs USA — 1963 vs 1959
| Riviera 425 Nailhead | Invicta Convertible 401 | |
|---|---|---|
| Horsepower | 340 hp | 325 hp |
| Torque | 465 lb-ft | 410 lb-ft |
| Engine Size | 6,965 cc | 6,571 cc |
| 0-60 mph | 7.7 sec | 8.5 sec |
| Top Speed | 125 mph | 118 mph |
| ¼ Mile | 15.5 sec | 16.0 sec |
| Weight | 4,200 lbs | 4,350 lbs |
| Wheelbase | 3,048 mm | 3,150 mm |
| Length | 5,334 mm | 5,562 mm |
| Units Produced | 40,000 | — |
| Original MSRP | $4,333 | $3,515 |
| Value (Excellent) | $85,000 | $85,000 |
| Collectibility | 8/10 | 7/10 |
| Rarity | 5/10 | 7/10 |
On balance, the 1963 Buick Riviera 425 Nailhead makes a stronger case on paper with quicker acceleration, higher top speed, stronger collectibility. However, the 1959 Buick Invicta Convertible 401 counters with its own distinct appeal, and its appeal extends beyond mere numbers. Choose the 1963 Buick Riviera 425 Nailhead 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 1963 Buick Riviera 425 Nailhead with the 1959 Buick Invicta Convertible 401 highlights the breadth of the marque's engineering philosophy. On paper, the two are remarkably close in power output, with the 1963 Buick Riviera 425 Nailhead producing 340 hp and the 1959 Buick Invicta Convertible 401 delivering 325 hp. Under the hood, the contrast is notable: the Buick Riviera uses a V8 OHV (Buick 425 Nailhead) displacing 6,965 cc, while the Buick Invicta relies on a V8 OHV (Buick 401 Nailhead) with 6,571 cc. In the sprint to 60 mph, the 1963 Buick Riviera 425 Nailhead edges ahead at 7.7 seconds versus 8.5 seconds. Each of these machines offers a unique window into the era that produced it, making both worthy of consideration by collectors and drivers alike.