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Austin-Healey 1B specs: 162 ci 4-cylinder, 87.3 x 111.1 mm (3.4370 x 4.3740 in) bore and stroke. Built 1953–1956.
The Austin-Healey 162ci (1B) is undersquare — the 4.374" stroke exceeds the 3.437" bore by 21.4% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.374" stroke, mean piston speed reaches 4,000 ft/min at only 5,500 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 4 cylinders displaces 40.5 ci (664 cc).
4 factory variants share these dimensions across 1953–1956.
| Displacement | 162 ci |
|---|---|
| Bore | 3.437" |
| Stroke | 4.374" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.786 |
| Fuel type | gas |
|---|---|
| Years | 1953–1956 |
| Bore/stroke character | 0.786 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,374 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 40.5 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 |
|---|---|---|
| 1953 | — | 1B |
| 1954 | — | 1B |
| 1955 | — | 1B |
| 1956 | — | 1B |
1 factory vehicle, 1953–1956. Each year opens that model's engine table.