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Jeep 304 specs: 304 ci (5.0L) 8-cylinder, 3.75 x 3.44 in (95.3 x 87.4 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 3.4402" stroke by 9.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.4402" 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).
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. Factory fitments include the Jeep CJ, Jeep CJ-7, Jeep J-Series Truck and 1 other.
| Displacement | 304 ci / 5 L |
|---|---|
| Bore | 3.75" |
| Stroke | 3.4402" |
| Cylinders | 8 |
| Compression ratio | 8.4:1 |
| Bore/stroke ratio | 1.09 |
| Piston deck clearance | 0.022" |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 150 hp |
| 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 |
| Static compression | 8.4:1 — low by modern standards, generally happy on regular pump fuel |
| Chamber volume | 50.7 cc |
|---|---|
| Rocker ratio | 1.6:1 |
| Lifter type | hydraulic |
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