GMC 400 Specs
GMC 400 engine specs: 400 ci (6.6L), 8-cylinder, 4.1248" bore x 3.7598" stroke, 8:1 compression.
Dimensions
| Displacement | 400 ci / 6.6 L |
|---|
| Bore | 4.1248" |
|---|
| Stroke | 3.7598" |
|---|
| Cylinders | 8 |
|---|
| Compression ratio | 8:1 |
|---|
| Bore/stroke ratio | 1.097 |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | OHV |
|---|
| Fuel type | gas |
|---|
| Advertised HP | 150 hp |
|---|
What these numbers mean
| Bore/stroke character | 1.097 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|
| Mean piston speed at 6,000 RPM | 3,760 ft/min — in the range typical of performance street engines |
|---|
| Displacement per cylinder | 50.0 ci |
|---|
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
|---|
Run the numbers for this engine
Each link opens the calculator with this engine's specs already filled in.
Vehicles (3)
- GMC C/K Series
- GMC Suburban
- GMC Sprint
Similar engines
← All Small Block Chevy engines