GMC 389 Specs
GMC 389 engine specs: 389 ci (6.4L), 8-cylinder, 4.0598" bore x 3.9402" stroke, 10.5:1 compression.
Dimensions
| Displacement | 389 ci / 6.4 L |
|---|
| Bore | 4.0598" |
|---|
| Stroke | 3.9402" |
|---|
| Cylinders | 8 |
|---|
| Compression ratio | 10.5:1 |
|---|
| Bore/stroke ratio | 1.03 |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | OHV |
|---|
| Fuel type | gas |
|---|
| Advertised HP | 348 hp |
|---|
What these numbers mean
| Bore/stroke character | 1.030 — square — bore and stroke are within 5%, a balanced compromise |
|---|
| Mean piston speed at 6,000 RPM | 3,940 ft/min — in the range typical of performance street engines |
|---|
| Displacement per cylinder | 48.6 ci |
|---|
| Static compression | 10.5:1 — 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 (4)
- Pontiac Bonneville
- Pontiac Catalina
- Pontiac Grand Prix
- Pontiac GTO
Similar engines
← All Pontiac V8 engines