USA vs USA — 1967 vs 1970
| Comet Cyclone GT | Road Runner Superbird | |
|---|---|---|
| Horsepower | 320 hp | 375 hp |
| Torque | 450 lb-ft | 490 lb-ft |
| Engine Size | 6,391 cc | 7,210 cc |
| 0-60 mph | 6.8 sec | 5.5 sec |
| Top Speed | 121 mph | 146 mph |
| ¼ Mile | 15.1 sec | 13.5 sec |
| Weight | 3,450 lbs | 3,800 lbs |
| Wheelbase | 2,972 mm | 2,972 mm |
| Length | 5,206 mm | 5,613 mm |
| Units Produced | 3,419 | 1,935 |
| Original MSRP | $2,848 | $4,298 |
| Value (Excellent) | $75,000 | $350,000 |
| Collectibility | 7/10 | 10/10 |
| Rarity | 7/10 | 10/10 |
Numbers favor the 1970 Plymouth Road Runner Superbird with more power, quicker acceleration, higher top speed. The 1967 Mercury Comet Cyclone GT offers lighter weight, better value, and has its own devoted following. For those who let their heart decide, either car delivers a rewarding ownership experience.
In the world of Muscle Car cars, few comparisons generate as much discussion as the 1967 Mercury Comet Cyclone GT versus the 1970 Plymouth Road Runner Superbird. Both hail from Muscle era and represent the pinnacle of their respective manufacturers' ambitions. The 1970 Plymouth Road Runner Superbird holds a clear advantage in raw power with 375 hp compared to 320 hp, a 55-horsepower difference that shapes the driving experience. In the sprint to 60 mph, the 1970 Plymouth Road Runner Superbird edges ahead at 5.5 seconds versus 6.8 seconds. The Mercury Comet carries a weight advantage, tipping the scales 350 lbs lighter. On the collector market, the 1970 Plymouth Road Runner Superbird commands a significant premium over the 1967 Mercury Comet Cyclone GT, reflecting differences in prestige and rarity. From a collectibility standpoint, the 1970 Plymouth Road Runner Superbird rates higher among enthusiasts and auction houses.