USA vs USA — 1968 vs 1979
| AMX 390 | Eagle SX/4 Liftback | |
|---|---|---|
| Horsepower | 315 hp | 110 hp |
| Torque | — | 205 lb-ft |
| Engine Size | 6,391 cc | 4,228 cc |
| 0-60 mph | — | 13.5 sec |
| Top Speed | — | 100 mph |
| ¼ Mile | — | 19.2 sec |
| Weight | — | 3,250 lbs |
| Wheelbase | 2,489 mm | 2,578 mm |
| Length | 4,384 mm | 4,547 mm |
| Units Produced | — | 197,060 |
| Original MSRP | — | $7,995 |
| Value (Excellent) | $85,000 | $18,000 |
| Collectibility | 5/10 | 6/10 |
| Rarity | 10/10 | 6/10 |
Two outstanding machines, each with compelling strengths. The 1968 AMC AMX 390 excels in more power, while the 1979 AMC Eagle SX/4 Liftback stands out for stronger collectibility, better value. The best advice? Drive both if you can, then follow your instincts.
The 1968 AMC AMX 390 and 1979 AMC Eagle SX/4 Liftback share a manufacturer in AMC, but that's where the similarities get interesting. These two models reveal the versatility and ambition of the AMC brand. The 1968 AMC AMX 390 holds a clear advantage in raw power with 315 hp compared to 110 hp, a 205-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the AMC AMX uses a V8 displacing 6,391 cc, while the AMC Eagle relies on a Inline-6 OHV with 4,228 cc. On the collector market, the 1968 AMC AMX 390 commands a significant premium over the 1979 AMC Eagle SX/4 Liftback, reflecting differences in prestige and rarity.