USA vs USA — 1962 vs 1957
| Grand Prix SJ 455 | Bonneville 421 SD | |
|---|---|---|
| Horsepower | 325 hp | 405 hp |
| Torque | 440 lb-ft | 425 lb-ft |
| Engine Size | 7,456 cc | 6,899 cc |
| 0-60 mph | 7.5 sec | 5.4 sec |
| Top Speed | 125 mph | 140 mph |
| ¼ Mile | 15.3 sec | 13.9 sec |
| Weight | 3,800 lbs | 3,900 lbs |
| Wheelbase | 2,946 mm | 3,048 mm |
| Length | 5,360 mm | 5,486 mm |
| Units Produced | 112,486 | — |
| Original MSRP | $3,549 | $3,349 |
| Value (Excellent) | $40,000 | $150,000 |
| Collectibility | 6/10 | 8/10 |
| Rarity | 5/10 | 9/10 |
The 1957 Pontiac Bonneville 421 SD emerges ahead in most objective measures, offering more power, quicker acceleration, higher top speed. The 1962 Pontiac Grand Prix SJ 455 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 1962 Pontiac Grand Prix SJ 455 and 1957 Pontiac Bonneville 421 SD share a manufacturer in Pontiac, but that's where the similarities get interesting. These two models reveal the versatility and ambition of the Pontiac brand. The 1957 Pontiac Bonneville 421 SD holds a clear advantage in raw power with 405 hp compared to 325 hp, a 80-horsepower difference that shapes the driving experience. In the sprint to 60 mph, the 1957 Pontiac Bonneville 421 SD edges ahead at 5.4 seconds versus 7.5 seconds. On the collector market, the 1957 Pontiac Bonneville 421 SD commands a significant premium over the 1962 Pontiac Grand Prix SJ 455, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1957 Pontiac Bonneville 421 SD rates higher among enthusiasts and auction houses.