USA vs USA — 1970 vs 1970
| AMX 390 Big Bad | Superbird 426 Hemi | |
|---|---|---|
| Horsepower | 325 hp | 425 hp |
| Torque | 425 lb-ft | 490 lb-ft |
| Engine Size | 6,391 cc | 6,981 cc |
| 0-60 mph | 6.6 sec | 5.5 sec |
| Top Speed | 130 mph | 140 mph |
| ¼ Mile | 14.4 sec | 13.5 sec |
| Weight | 3,300 lbs | 3,750 lbs |
| Wheelbase | 2,794 mm | 2,946 mm |
| Length | 4,877 mm | 5,639 mm |
| Units Produced | 4,116 | 1,920 |
| Original MSRP | $3,395 | $4,298 |
| Value (Excellent) | $65,000 | $500,000 |
| Collectibility | 8/10 | 10/10 |
| Rarity | 7/10 | 10/10 |
The 1970 Plymouth Superbird 426 Hemi emerges ahead in most objective measures, offering more power, quicker acceleration, higher top speed. The 1970 AMC AMX 390 Big Bad counters with lighter weight, 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 1970 AMC AMX 390 Big Bad and 1970 Plymouth Superbird 426 Hemi stand as two of the most notable Muscle Car cars from Muscle era. Both emerged during a period of intense competition, and choosing between them remains a passionate debate among collectors. The 1970 Plymouth Superbird 426 Hemi holds a clear advantage in raw power with 425 hp compared to 325 hp, a 100-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the AMC AMX uses a V8 OHV (AMC 390) displacing 6,391 cc, while the Plymouth Superbird relies on a V8 OHV (426 Hemi) with 6,981 cc. In the sprint to 60 mph, the 1970 Plymouth Superbird 426 Hemi edges ahead at 5.5 seconds versus 6.6 seconds. The AMC AMX carries a weight advantage, tipping the scales 450 lbs lighter. On the collector market, the 1970 Plymouth Superbird 426 Hemi commands a significant premium over the 1970 AMC AMX 390 Big Bad, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1970 Plymouth Superbird 426 Hemi rates higher among enthusiasts and auction houses.