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Oldsmobile V8 (1968–1969) specs: 400 ci (6.6L) 8-cylinder, 4.00 x 3.972 in (101.6 x 100.9 mm) bore and stroke. Rated 325-350 hp, 1968–1969.
The Oldsmobile V8 (1968–1969) is close to square: 4" bore against 3.9724" stroke, within 0.7%, which splits the difference between a high-revving layout and a torque layout. The 3.9724" stroke puts mean piston speed at 4,000 ft/min around 6,050 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 50.0 ci (819 cc).
It is one of 11 engines in the Oldsmobile V8 family, sitting between the 330 ci and 455 ci members. 3 factory variants share these dimensions, rated from 325 to 350 hp across 1968–1969.
| Displacement | 400 ci / 6.6 L |
|---|---|
| Bore | 4" |
| Stroke | 3.9724" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.007 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 325–350 hp |
| Years | 1968–1969 |
| Bore/stroke character | 1.007 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,972 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 50.0 ci |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1968 | 325 hp | — |
| 1968 | 350 hp | — |
| 1969 | 325 hp | — |