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Studebaker 304ci (1964) specs: 304 ci 8-cylinder, 3.656 x 3.625 in (92.9 x 92.1 mm) bore and stroke. Rated 335 hp, 1964. Used in the Studebaker Avanti.
The Studebaker 304ci (1964) is close to square: 3.6563" bore against 3.625" stroke, within 0.9%, which splits the difference between a high-revving layout and a torque layout. The 3.625" stroke puts mean piston speed at 4,000 ft/min around 6,600 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 38.0 ci (623 cc).
| Displacement | 304 ci |
|---|---|
| Bore | 3.6563" * |
| Stroke | 3.625" * |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9.6–9.75:1 (published figures vary) |
| Bore/stroke ratio | 1.009 |
* Bore and stroke from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 335 hp |
| Years | 1964 |
| Bore/stroke character | 1.009 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,625 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.0 ci |
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1 factory vehicle, 1964. Each year opens that model's engine table.