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Ram Magnum specs: 488 ci (8.0L) 10-cylinder, 4.00 x 3.882 in (101.6 x 98.6 mm) bore and stroke, 8.4:1 compression. Rated 300-310 hp. OHV.
The Ram Magnum is close to square: 4" bore against 3.8819" stroke, within 3.0%, which splits the difference between a high-revving layout and a torque layout. The 3.8819" stroke puts mean piston speed at 4,000 ft/min around 6,200 RPM, which is where a production bottom end is generally considered at its limit. Each of the 10 cylinders displaces 48.8 ci (800 cc).
8.4:1 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, the largest at 488 ci. 2 factory variants share these dimensions, rated from 300 to 310 hp. Factory fitments include the Ram 2500, Ram 3500, Dodge Ram 2500 and 1 other.
| Displacement | 488 ci / 8 L |
|---|---|
| Bore | 4" |
| Stroke | 3.8819" |
| Cylinders | 10 |
| Compression ratio | 8.4:1 |
| Bore/stroke ratio | 1.03 |
| Block material | cast iron |
|---|---|
| Head material | cast iron |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 300–310 hp |
| Bore/stroke character | 1.030 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,882 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 48.8 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 |
|---|---|---|
| — | 300 hp | V10 8.0L |
| — | 310 hp | Magnum V10, 8.0L V10, ECB |