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Nash 320ci (1955) specs: 320 ci 8-cylinder, 3.813 x 3.50 in (96.8 x 88.9 mm) bore and stroke. Rated 208 hp, 1955. Used in the Nash Nash.
The Nash 320ci (1955) is oversquare — the 3.8125" bore exceeds the 3.5" stroke by 8.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.5" stroke puts mean piston speed at 4,000 ft/min around 6,850 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 40.0 ci (655 cc).
| Displacement | 320 ci |
|---|---|
| Bore | 3.8125" |
| Stroke | 3.5" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 7.8–8.25:1 (published figures vary) |
| Bore/stroke ratio | 1.089 |
| Fuel type | gas |
|---|---|
| Advertised HP | 208 hp |
| Years | 1955 |
| Bore/stroke character | 1.089 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,500 ft/min — conservative for a street engine |
| Displacement per cylinder | 40.0 ci |
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1 factory vehicle, 1955. Each year opens that model's engine table.