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Oldsmobile 330 specs: 330 ci (5.4L) 8-cylinder, 3.937 x 3.382 in (100 x 85.9 mm) bore and stroke, 9:1 compression. Rated 230 hp. Rod ratio and piston speed.
The Oldsmobile V8 (330) is oversquare — the 3.937" bore exceeds the 3.3819" stroke by 16.4% — a layout that favors airflow and RPM over leverage at the crank. The 3.3819" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 41.3 ci (676 cc).
9:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Oldsmobile V8 family, the smallest at 330 ci. Factory fitments include the Cutlass, F-85, Vista Cruiser.
| Displacement | 330 ci / 5.4 L |
|---|---|
| Bore | 3.937" |
| Stroke | 3.3819" |
| Cylinders | 8 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 1.164 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 230 hp |
| Bore/stroke character | 1.164 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,382 ft/min — conservative for a street engine |
| Displacement per cylinder | 41.3 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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