USA vs USA — 1982 vs 1957
| Firebird Trans Am GTA | Bonneville 421 SD | |
|---|---|---|
| Horsepower | 235 hp | 405 hp |
| Torque | 330 lb-ft | 425 lb-ft |
| Engine Size | 5,733 cc | 6,899 cc |
| 0-60 mph | 6.3 sec | 5.4 sec |
| Top Speed | 145 mph | 140 mph |
| ¼ Mile | 14.5 sec | 13.9 sec |
| Weight | 3,300 lbs | 3,900 lbs |
| Wheelbase | 2,565 mm | 3,048 mm |
| Length | 4,930 mm | 5,486 mm |
| Units Produced | 125,886 | — |
| Original MSRP | $17,995 | $3,349 |
| Value (Excellent) | $35,000 | $150,000 |
| Collectibility | 6/10 | 8/10 |
| Rarity | 4/10 | 9/10 |
It's a closely fought contest. The 1982 Pontiac Firebird Trans Am GTA brings higher top speed, lighter weight, better value to the table, and the 1957 Pontiac Bonneville 421 SD answers with more power, quicker acceleration, stronger collectibility. Both are excellent machines that reward their owners in different ways — there's no wrong answer here.
Pontiac has long offered a diverse lineup, and comparing the 1982 Pontiac Firebird Trans Am GTA with the 1957 Pontiac Bonneville 421 SD highlights the breadth of the marque's engineering philosophy. The 1957 Pontiac Bonneville 421 SD holds a clear advantage in raw power with 405 hp compared to 235 hp, a 170-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Pontiac Firebird uses a V8 OHV (Chevrolet 350 TPI) displacing 5,733 cc, while the Pontiac Bonneville relies on a V8 OHV with 6,899 cc. In the sprint to 60 mph, the 1957 Pontiac Bonneville 421 SD edges ahead at 5.4 seconds versus 6.3 seconds. The Pontiac Firebird carries a weight advantage, tipping the scales 600 lbs lighter. On the collector market, the 1957 Pontiac Bonneville 421 SD commands a significant premium over the 1982 Pontiac Firebird Trans Am GTA, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1957 Pontiac Bonneville 421 SD rates higher among enthusiasts and auction houses.