Oldsmobile 403ci 9.181:1 Specs
Oldsmobile Oldsmobile 403ci · 4.351" × 3.385" · 9.181:1 engine specs: 403 ci (6.6L), 8-cylinder, 4.351" bore x 3.385" stroke, 9.181:1 compression.
Dimensions
| Displacement | 403 ci / 6.6 L |
|---|
| Bore | 4.351" |
|---|
| Stroke | 3.385" |
|---|
| Cylinders | 8 |
|---|
| Configuration | V8 |
|---|
| Compression ratio | 9.181:1 |
|---|
| Rod length | 6.002" |
|---|
| Rod ratio | 1.773 |
|---|
| Bore/stroke ratio | 1.285 |
|---|
Construction
| Block material | cast iron |
|---|
| Head material | cast iron |
|---|
| Valvetrain | OHV |
|---|
| Fuel type | gas |
|---|
| Advertised HP | 185–200 hp |
|---|
| Years | 1977 |
|---|
What these numbers mean
| Bore/stroke character | 1.285 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|
| Mean piston speed at 6,000 RPM | 3,385 ft/min — conservative for a street engine |
|---|
| Rod ratio | 1.773 — long — less side loading on the cylinder wall, favours high RPM |
|---|
| Displacement per cylinder | 50.4 ci |
|---|
| Static compression | 9.181:1 — low by modern standards, generally happy on regular pump fuel |
|---|
Cylinder head
| Intake valve diameter | 2" |
|---|
| Exhaust valve diameter | 1.5" |
|---|
Run the numbers for this engine
Each link opens the calculator with this engine's specs already filled in.
Variants sharing these dimensions (2)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|
| 1977 | 185 hp | — |
| 1977 | 200 hp | — |
Similar engines
← All Oldsmobile 403ci engines