Plymouth R Specs
Plymouth R engine specs: 426 ci (7L), 8-cylinder, 4.252" bore x 3.6299" stroke, 10.25:1 compression.
Dimensions
| Displacement | 426 ci / 7 L |
|---|
| Bore | 4.252" |
|---|
| Stroke | 3.6299" |
|---|
| Cylinders | 8 |
|---|
| Compression ratio | 10.25:1 |
|---|
| Bore/stroke ratio | 1.171 |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | OHV |
|---|
| Fuel type | gas |
|---|
| Advertised HP | 425 hp |
|---|
What these numbers mean
| Bore/stroke character | 1.171 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|
| Mean piston speed at 6,000 RPM | 3,630 ft/min — in the range typical of performance street engines |
|---|
| Displacement per cylinder | 53.3 ci |
|---|
| Static compression | 10.25:1 — in the range that usually runs on pump premium |
|---|
Run the numbers for this engine
Each link opens the calculator with this engine's specs already filled in.
Vehicles (3)
- Plymouth Hemi 'Cuda
- Plymouth Road Runner Hemi
- Plymouth GTX
Similar engines
← All 426 Hemi engines