USA vs USA — 1968 vs 1970
| AMX 390 | AMX 390 Big Bad | |
|---|---|---|
| Horsepower | 315 hp | 325 hp |
| Torque | — | 425 lb-ft |
| Engine Size | 6,391 cc | 6,391 cc |
| 0-60 mph | — | 6.6 sec |
| Top Speed | — | 130 mph |
| ¼ Mile | — | 14.4 sec |
| Weight | — | 3,300 lbs |
| Wheelbase | 2,489 mm | 2,794 mm |
| Length | 4,384 mm | 4,877 mm |
| Units Produced | — | 4,116 |
| Original MSRP | — | $3,395 |
| Value (Excellent) | $85,000 | $65,000 |
| Collectibility | 5/10 | 8/10 |
| Rarity | 10/10 | 7/10 |
The 1970 AMC AMX 390 Big Bad emerges ahead in most objective measures, offering stronger collectibility, better value. The 1968 AMC AMX 390 counters with its unique character, 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.
Tracing the evolution of the AMC AMX from 1968 to 1970 offers a compelling look at how automotive design and engineering progressed. These two variants showcase the changing face of AMC. On paper, the two are remarkably close in power output, with the 1968 AMC AMX 390 producing 315 hp and the 1970 AMC AMX 390 Big Bad delivering 325 hp. Under the hood, the contrast is notable: the AMC AMX uses a V8 displacing 6,391 cc, while the AMC AMX relies on a V8 OHV (AMC 390) with 6,391 cc. From a collectibility standpoint, the 1970 AMC AMX 390 Big Bad rates higher among enthusiasts and auction houses.