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Toyota K specs: 1.1L (66 ci) 4-cylinder, 75 x 61 mm (2.9528 x 2.4016 in) bore and stroke. Rated 60 hp, 1968–1970. Used in the Toyota Corolla.
The Toyota 66ci (K) is oversquare — the 2.9528" bore exceeds the 2.4016" stroke by 23.0% — a layout that favors airflow and RPM over leverage at the crank. The 2.4016" stroke does not reach 4,000 ft/min of mean piston speed until about 10,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 16.5 ci (270 cc).
3 factory variants share these dimensions, rated at 60 hp across 1968–1970.
| Displacement | 66 ci / 1.1 L |
|---|---|
| Bore | 2.9528" |
| Stroke | 2.4016" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.23 |
| Fuel type | gas |
|---|---|
| Advertised HP | 60 hp |
| Years | 1968–1970 |
| Bore/stroke character | 1.230 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 16.5 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 |
|---|---|---|
| 1968 | — | K |
| 1969 | 60 hp | K |
| 1970 | 60 hp | K |
1 factory vehicle, 1968–1970. Each year opens that model's engine table.