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Ram Magnum specs: 360 ci (5.9L) 8-cylinder, 4.00 x 3.598 in (101.6 x 91.4 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 3.5984" stroke by 11.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.5984" stroke puts mean piston speed at 4,000 ft/min around 6,650 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 13 engines in the Magnum family, sitting between the 226 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 | 3.5984" |
| Cylinders | 8 |
| Compression ratio | 9.1:1 |
| Bore/stroke ratio | 1.112 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 245 hp |
| Bore/stroke character | 1.112 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,598 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 |