Makes › Plymouth › Road Runner and Superbird › First generation › Road Runner Superbird 426 Hemi · Factory competition · 1970 Extremely Rare
Plymouth
Road Runner Superbird 426 Hemi
NASCAR homologation aero car fitted with the 426 Hemi (most Superbirds had the 440)
Still being researched: identification guide, full specifications. Everything shown is checked against the cited sources. Know more? Send us a source.
Contents
01Overview
At a glance
- Built
- 135 Built
- Years
- 1970
- Engine
- Front-mounted 426 Hemi V8, rear-wheel drive · 6,980 cc / 7.0 LFactory: 426 cu in · converted
- Power
- 317 kW / 431 PSFactory: 425 hp · converted
- Top speed
- Not yet verified
- Body
- Not yet verified
- Designer
- Not yet verified
- In this archive
- Not yet verified
- Surviving
- Not yet verified
Sources and any conflicting figures are in the sections below.
Why it matters
The Superbird was Plymouth's NASCAR homologation aero car for 1970, with a low-drag nose cone and towering rear wing. Of 1,920 built, only 135 had the 426 Hemi, making the Hemi Superbird the rarest engine version.
How rare is it?
Six separate kinds of rarity – never combined into one number.
Each kind of rarity is rated separately and never combined.
02Production & history
Production
Every figure says what it counts.
| What is counted | Figure | Basis | Status |
|---|---|---|---|
| Total model productionSuperbirds with the 426 Hemi (of about 1,920 total) | 1351 | Factory production | Independently researched |
Independent counts (e.g. engine and colour) are never combined into a calculated figure. Surviving examples are never presented as original production.
History
Chrysler's aero programme began with the Dodge Charger 500 and Charger Daytona of 1969; the Superbird was Plymouth's 1970 evolution built to win in NASCAR. Based on the B-body Road Runner, it gained a reshaped nose with pop-up headlamp covers and a tall strut-mounted rear wing. Most of the 1,920 cars used the 440, but 135 received the 426 Hemi with two Carter AFB four-barrels, rated at 425 hp and 490 lb-ft, with an A833 four-speed or 727 TorqueFlite automatic.
Variants
How each version differs from the standard Road Runner Superbird 426 Hemi.
No variants documented yet. Have a source? Contribute it.
03Specifications
Technical specifications
Engine
| Engine family | Not yet verified |
|---|---|
| Engine code | Not yet verified |
| Layout | Front-mounted 426 Hemi V8, rear-wheel drive2 Independently researched |
| Displacement | 6,980 cc / 7.0 LFactory: 426 cu in · converted2 Independently researched |
| Bore | Not yet verified |
| Stroke | Not yet verified |
| Compression ratio | Not yet verified |
| Fuel system | Not yet verified |
| Power | 317 kW / 431 PSFactory: 425 hp · converted2Source states bhp. |
| Power at | Not yet verified |
| Torque | 664 NmFactory: 490 lb-ft · converted2 |
Transmission & drivetrain
| Gearbox | A833 four-speed manual or 727 TorqueFlite automatic2 Independently researched |
|---|---|
| Gears | Not yet verified |
| Driven wheels | Not yet verified |
Chassis, body & dimensions
| Chassis | Not yet verified |
|---|---|
| Front suspension | Not yet verified |
| Rear suspension | Not yet verified |
| Brakes | Not yet verified |
| Steering | Not yet verified |
| Body construction | Not yet verified |
| Wheelbase | Not yet verified |
| Length | Not yet verified |
| Width | Not yet verified |
| Height | Not yet verified |
| Front track | Not yet verified |
| Rear track | Not yet verified |
| Kerb weight | Not yet verified |
| Dry weight | Not yet verified |
Performance
| Maximum speed | Not yet verified |
|---|---|
| 0–100 km/h | Not yet verified |
| Fuel tank | Not yet verified |
“Not yet verified” means no source has been checked for that value yet. Nothing is estimated to fill a gap.
04Colours & options
Factory colours & interiors
Original paint and trim, with the number of cars in each where a source gives it.
Not yet documented. Have a source? Contribute it.
Factory options & codes
Codes are shown exactly as written by the manufacturer.
Not yet documented. Have a source? Contribute it.
05Individual cars
Chassis register
Every documented car, with its colours, history and where it is now. Open a row for the full record. Known chassis are not automatically authenticated originals.
Not yet documented. Have a source? Contribute it.
Competition history
Every race result of the individual cars, in date order. Click a chassis number to open its full record in the register.
Not yet documented. Have a source? Contribute it.
Auction & sale history
Documented public sales of the individual cars. Click a chassis number to open its full record in the register.
Not yet documented. Have a source? Contribute it.
See one in person
Museums where an example of this car can be seen.
No example is documented on public display yet. Have a source? Contribute it.
06Reference
Identification guide
How to tell an original from a replica or later conversion.
Not yet documented. Have a source? Contribute it.
Sources
Each number links to the exact facts it supports.
-
1
Street Muscle – Rare Rides: The 1970 Plymouth Hemi Superbird Level C
- 135 Superbirds with the 426 Hemi (of about 1,920 total)
-
2
Rare Rides: The 1970 Plymouth Hemi Superbird Level C Street Muscle
- a standard FR layout
- 426 Hemi V8
- factory underrated at 425 brake horsepower
- 490 lb-ft of torque
- heavy-duty A833 4-speed manual or a 727 Torqueflite
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