USA vs USA — 1963 vs 1976
| Riviera 425 Nailhead | Regal Grand National | |
|---|---|---|
| Horsepower | 340 hp | 245 hp |
| Torque | 465 lb-ft | 355 lb-ft |
| Engine Size | 6,965 cc | 3,791 cc |
| 0-60 mph | 7.7 sec | 5.5 sec |
| Top Speed | 125 mph | 125 mph |
| ¼ Mile | 15.5 sec | 13.9 sec |
| Weight | 4,200 lbs | 3,476 lbs |
| Wheelbase | 3,048 mm | 2,743 mm |
| Length | 5,334 mm | 5,067 mm |
| Units Produced | 40,000 | 20,193 |
| Original MSRP | $4,333 | $16,608 |
| Value (Excellent) | $85,000 | $75,000 |
| Collectibility | 8/10 | 9/10 |
| Rarity | 5/10 | 7/10 |
Numbers favor the 1976 Buick Regal Grand National with quicker acceleration, lighter weight, stronger collectibility. The 1963 Buick Riviera 425 Nailhead offers more power, and has its own devoted following. For those who let their heart decide, either car delivers a rewarding ownership experience.
Buick has long offered a diverse lineup, and comparing the 1963 Buick Riviera 425 Nailhead with the 1976 Buick Regal Grand National highlights the breadth of the marque's engineering philosophy. The 1963 Buick Riviera 425 Nailhead holds a clear advantage in raw power with 340 hp compared to 245 hp, a 95-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Buick Riviera uses a V8 OHV (Buick 425 Nailhead) displacing 6,965 cc, while the Buick Regal relies on a V6 Turbocharged with 3,791 cc. In the sprint to 60 mph, the 1976 Buick Regal Grand National edges ahead at 5.5 seconds versus 7.7 seconds. The Buick Regal carries a weight advantage, tipping the scales 724 lbs lighter. Each of these machines offers a unique window into the era that produced it, making both worthy of consideration by collectors and drivers alike.