USA vs USA — 1970 vs 1967
| Superbird 426 Hemi | Comet Cyclone GT | |
|---|---|---|
| Horsepower | 425 hp | 320 hp |
| Torque | 490 lb-ft | 450 lb-ft |
| Engine Size | 6,981 cc | 6,391 cc |
| 0-60 mph | 5.5 sec | 6.8 sec |
| Top Speed | 140 mph | 121 mph |
| ¼ Mile | 13.5 sec | 15.1 sec |
| Weight | 3,750 lbs | 3,450 lbs |
| Wheelbase | 2,946 mm | 2,972 mm |
| Length | 5,639 mm | 5,206 mm |
| Units Produced | 1,920 | 3,419 |
| Original MSRP | $4,298 | $2,848 |
| Value (Excellent) | $500,000 | $75,000 |
| Collectibility | 10/10 | 7/10 |
| Rarity | 10/10 | 7/10 |
The 1970 Plymouth Superbird 426 Hemi holds an edge across most measurable criteria, offering more power, quicker acceleration, higher top speed. That said, the 1967 Mercury Comet Cyclone GT brings lighter weight, better value and remains a compelling choice for enthusiasts who value Mercury heritage. The right pick depends on whether you prioritize specifications or the intangible qualities that make a car truly special.
Among Muscle Car enthusiasts, the matchup between the 1970 Plymouth Superbird 426 Hemi and 1967 Mercury Comet Cyclone GT is one for the ages. These Muscle era machines competed directly for buyers' attention and continue to vie for collectors' affections today. The 1970 Plymouth Superbird 426 Hemi holds a clear advantage in raw power with 425 hp compared to 320 hp, a 105-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Plymouth Superbird uses a V8 OHV (426 Hemi) displacing 6,981 cc, while the Mercury Comet relies on a V8 OHV with 6,391 cc. In the sprint to 60 mph, the 1970 Plymouth Superbird 426 Hemi edges ahead at 5.5 seconds versus 6.8 seconds. The Mercury Comet carries a weight advantage, tipping the scales 300 lbs lighter. On the collector market, the 1970 Plymouth Superbird 426 Hemi commands a significant premium over the 1967 Mercury Comet Cyclone GT, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1970 Plymouth Superbird 426 Hemi rates higher among enthusiasts and auction houses.