USA vs USA — 1963 vs 1970
| Riviera 425 Nailhead | GSX Stage 1 455 | |
|---|---|---|
| Horsepower | 340 hp | 360 hp |
| Torque | 465 lb-ft | 510 lb-ft |
| Engine Size | 6,965 cc | 7,456 cc |
| 0-60 mph | 7.7 sec | 5.5 sec |
| Top Speed | 125 mph | 130 mph |
| ¼ Mile | 15.5 sec | 13.4 sec |
| Weight | 4,200 lbs | 3,600 lbs |
| Wheelbase | 3,048 mm | 2,845 mm |
| Length | 5,334 mm | 5,156 mm |
| Units Produced | 40,000 | 678 |
| Original MSRP | $4,333 | $3,283 |
| Value (Excellent) | $85,000 | $250,000 |
| Collectibility | 8/10 | 9/10 |
| Rarity | 5/10 | 8/10 |
The 1970 Buick GSX Stage 1 455 emerges ahead in most objective measures, offering quicker acceleration, higher top speed, lighter weight. The 1963 Buick Riviera 425 Nailhead counters with better value, but the numbers favor its rival. Still, both are remarkable machines, and the final choice often comes down to which driving experience speaks to you.
The 1963 Buick Riviera 425 Nailhead and 1970 Buick GSX Stage 1 455 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 1970 Buick GSX Stage 1 455 holds a clear advantage in raw power with 360 hp compared to 340 hp, a 20-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 GSX relies on a V8 OHV (Buick 455 Stage 1) with 7,456 cc. In the sprint to 60 mph, the 1970 Buick GSX Stage 1 455 edges ahead at 5.5 seconds versus 7.7 seconds. The Buick GSX carries a weight advantage, tipping the scales 600 lbs lighter. Rarity plays a significant role here — with only 678 units built, the 1970 Buick GSX Stage 1 455 is considerably scarcer than the Buick Riviera's 40,000 examples. On the collector market, the 1970 Buick GSX Stage 1 455 commands a significant premium over the 1963 Buick Riviera 425 Nailhead, reflecting differences in prestige and rarity.