USA vs USA — 1963 vs 1965
| Riviera 1st Generation | Riviera Gran Sport 425 | |
|---|---|---|
| Horsepower | 325 hp | 360 hp |
| Torque | 425 lb-ft | 465 lb-ft |
| Engine Size | 6,571 cc | 6,965 cc |
| 0-60 mph | 8.0 sec | 7.2 sec |
| Top Speed | 120 mph | 130 mph |
| ¼ Mile | 15.5 sec | 15.3 sec |
| Weight | — | 4,500 lbs |
| Wheelbase | 3,023 mm | 3,073 mm |
| Length | 5,334 mm | 5,410 mm |
| Units Produced | 40,000 | 3,961 |
| Original MSRP | — | $4,424 |
| Value (Excellent) | $65,000 | $95,000 |
| Collectibility | 5/10 | 8/10 |
| Rarity | 5/10 | 7/10 |
Numbers favor the 1965 Buick Riviera Gran Sport 425 with more power, quicker acceleration, higher top speed. The 1963 Buick Riviera 1st Generation offers its unique character, and has its own devoted following. For those who let their heart decide, either car delivers a rewarding ownership experience.
Few model names carry as much weight as the Buick Riviera. The 1963 and 1965 iterations represent different chapters in this storied nameplate's history, each reflecting the priorities and technologies of its era. The 1965 Buick Riviera Gran Sport 425 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 Riviera uses a V8 OHV displacing 6,571 cc, while the Buick Riviera relies on a V8 OHV (Buick 425 Nailhead) with 6,965 cc. In the sprint to 60 mph, the 1965 Buick Riviera Gran Sport 425 edges ahead at 7.2 seconds versus 8.0 seconds. Rarity plays a significant role here — with only 3,961 units built, the 1965 Buick Riviera Gran Sport 425 is considerably scarcer than the Buick Riviera's 40,000 examples. Both trade at comparable values on the collector market, making the choice between them largely one of personal preference. From a collectibility standpoint, the 1965 Buick Riviera Gran Sport 425 rates higher among enthusiasts and auction houses.