USA vs USA — 1968 vs 1970
| Road Runner 426 Hemi | Road Runner Superbird | |
|---|---|---|
| Horsepower | 425 hp | 375 hp |
| Torque | 490 lb-ft | 490 lb-ft |
| Engine Size | 6,981 cc | 7,210 cc |
| 0-60 mph | 5.3 sec | 5.5 sec |
| Top Speed | 150 mph | 146 mph |
| ¼ Mile | 13.5 sec | 13.5 sec |
| Weight | — | 3,800 lbs |
| Wheelbase | 2,946 mm | 2,972 mm |
| Length | 5,156 mm | 5,613 mm |
| Units Produced | — | 1,935 |
| Original MSRP | — | $4,298 |
| Value (Excellent) | $250,000 | $350,000 |
| Collectibility | 5/10 | 10/10 |
| Rarity | 8/10 | 10/10 |
The 1968 Plymouth Road Runner 426 Hemi holds an edge across most measurable criteria, offering more power, quicker acceleration, higher top speed. That said, the 1970 Plymouth Road Runner Superbird brings stronger collectibility and remains a compelling choice for enthusiasts who value Plymouth heritage. The right pick depends on whether you prioritize specifications or the intangible qualities that make a car truly special.
Tracing the evolution of the Plymouth Road Runner from 1968 to 1970 offers a compelling look at how automotive design and engineering progressed. These two variants showcase the changing face of Plymouth. The 1968 Plymouth Road Runner 426 Hemi holds a clear advantage in raw power with 425 hp compared to 375 hp, a 50-horsepower difference that shapes the driving experience. Under the hood, the contrast is notable: the Plymouth Road Runner uses a V8 OHV Hemi displacing 6,981 cc, while the Plymouth Road Runner relies on a V8 OHV with 7,210 cc. In the sprint to 60 mph, the 1968 Plymouth Road Runner 426 Hemi edges ahead at 5.3 seconds versus 5.5 seconds. From a collectibility standpoint, the 1970 Plymouth Road Runner Superbird rates higher among enthusiasts and auction houses.