GMC 6-71 Specs
GMC 6-71 engine specs: 426 ci (6.98L), 6-cylinder, 4.252" bore x 4.4882" stroke, 18.7:1 compression.
Dimensions
| Displacement | 426 ci / 6.98 L |
|---|
| Bore | 4.252" |
|---|
| Stroke | 4.4882" |
|---|
| Cylinders | 6 |
|---|
| Compression ratio | 18.7:1 |
|---|
| Bore/stroke ratio | 0.947 |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | OHV |
|---|
| Fuel type | diesel |
|---|
| Advertised HP | 238 hp |
|---|
What these numbers mean
| Bore/stroke character | 0.947 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|
| Mean piston speed at 6,000 RPM | 4,488 ft/min — in the range typical of performance street engines |
|---|
| Displacement per cylinder | 71.0 ci |
|---|
| Static compression | 18.7:1 — high enough that pump premium or better is normally required |
|---|
Run the numbers for this engine
Each link opens the calculator with this engine's specs already filled in.
Vehicles (3)
- GMC PD-4501 Scenicruiser
- M4 Sherman (some variants)
- Various industrial, marine, and bus applications
Similar engines
← All Detroit Diesel I6 (Two-Stroke) engines