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Jeep 304 specs: 304 ci (5.0L) 8-cylinder, 3.75 x 3.50 in (95.3 x 88.9 mm) bore and stroke, 8.4:1 compression. Rated 150 hp. OHV. Rod ratio and piston speed.
The Jeep AMC V8 (304) is oversquare — the 3.75" bore exceeds the 3.5" stroke by 7.1% — 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 38.0 ci (623 cc).
8.4:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 7 engines in the AMC V8 family, the smallest at 304 ci. 2 factory variants share these dimensions, rated at 150 hp. Factory fitments include the Jeep CJ-7, Jeep J-Series Truck, Jeep Wagoneer SJ and 8 others.
| Displacement | 304 ci / 5 L |
|---|---|
| Bore | 3.75" |
| Stroke | 3.5" |
| Cylinders | 8 |
| Compression ratio | 8.4:1 |
| Bore/stroke ratio | 1.071 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 150 hp |
| Bore/stroke character | 1.071 — 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 | 38.0 ci |
| Static compression | 8.4:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| — | 150 hp | 304 |
| — | 150 hp | 304 |