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Ram Magnum specs: 360 ci (5.9L) 8-cylinder, 4.00 x 3.58 in (101.6 x 90.9 mm) bore and stroke, 9.1:1 compression. Rated 245 hp. Rod ratio and piston speed.
The Ram Magnum is oversquare — the 4" bore exceeds the 3.58" stroke by 11.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.58" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 45.0 ci (737 cc).
9.1:1 on iron heads is low by modern standards and generally happy on regular pump fuel.
It is one of 8 engines in the Magnum family, sitting between the 239 ci and 488 ci members. 2 factory variants share these dimensions, rated at 245 hp. Factory fitments include the Ram 1500, Ram 2500, Ram 3500 and 3 others.
| Displacement | 360 ci / 5.9 L |
|---|---|
| Bore | 4" |
| Stroke | 3.58" |
| Cylinders | 8 |
| Compression ratio | 9.1:1 |
| Bore/stroke ratio | 1.117 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 245 hp |
| Bore/stroke character | 1.117 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,580 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 45.0 ci |
| Static compression | 9.1:1 — 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 |
|---|---|---|
| — | 245 hp | LA 5.9L |
| — | 245 hp | Magnum 5.9, 5.9L V8, EHC, 5.9L Magnum |