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Jeep Buick 225 specs: 225 ci (3.7L) 6-cylinder, 3.752 x 3.402 in (95.3 x 86.4 mm) bore and stroke. Rated 160 hp, 1965–1971. Used in the Jeep CJ. OHV.
The Jeep Buick 225 is oversquare — the 3.752" bore exceeds the 3.4016" stroke by 10.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.4016" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 37.5 ci (615 cc).
It is one of 3 engines in the Dauntless family, the smallest at 225 ci. 7 factory variants share these dimensions, rated at 160 hp across 1965–1971.
| Displacement | 225 ci / 3.7 L |
|---|---|
| Bore | 3.752" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 1.103 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 160 hp |
| Years | 1965–1971 |
| Bore/stroke character | 1.103 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 37.5 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 |
|---|---|---|
| 1965 | 160 hp | Buick 225 |
| 1966 | 160 hp | Buick 225 |
| 1967 | 160 hp | Buick 225 |
| 1968 | 160 hp | Buick 225 |
| 1969 | 160 hp | Buick 225 |
| 1970 | 160 hp | Buick 225 |
| 1971 | 160 hp | Buick 225 |