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Jeep AMC 304 specs: 304 ci (5.0L) 8-cylinder, 3.75 x 3.44 in (95.3 x 87.4 mm) bore and stroke. Rated 150-210 hp, 1971–1972. Used in the Jeep Gladiator. OHV.
The Jeep AMC 304 is oversquare — the 3.75" bore exceeds the 3.44" stroke by 9.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.44" stroke puts mean piston speed at 4,000 ft/min around 7,000 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).
It is one of 15 engines in the AMC V8 family, the smallest at 304 ci. 2 factory variants share these dimensions, rated from 150 to 210 hp across 1971–1972.
| Displacement | 304 ci / 5 L |
|---|---|
| Bore | 3.75" |
| Stroke | 3.44" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.09 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 150–210 hp |
| Years | 1971–1972 |
| Bore/stroke character | 1.090 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,440 ft/min — conservative for a street engine |
| Displacement per cylinder | 38.0 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 |
|---|---|---|
| 1971 | 210 hp | AMC 304 |
| 1972 | 150 hp | AMC 304 |