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Ram 83 Viper V10 specs: 505 ci (8.3L) 10-cylinder, 4.032 x 3.961 in (102.4 x 100.6 mm) bore and stroke, 9.6:1 compression. Rated 500 hp. OHV.
The Ram 83 Viper V10 is close to square: 4.0315" bore against 3.9606" stroke, within 1.8%, which splits the difference between a high-revving layout and a torque layout. The 3.9606" stroke puts mean piston speed at 4,000 ft/min around 6,050 RPM, which is where a production bottom end is generally considered at its limit. Each of the 10 cylinders displaces 50.5 ci (828 cc).
9.6:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 3 engines in the Viper family, the largest at 505 ci. Factory fitments include the Dodge Ram SRT-10, Ram SRT-10.
| Displacement | 505 ci / 8.3 L |
|---|---|
| Bore | 4.0315" |
| Stroke | 3.9606" |
| Cylinders | 10 |
| Compression ratio | 9.6:1 |
| Bore/stroke ratio | 1.018 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 500 hp |
| Bore/stroke character | 1.018 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,961 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 50.5 ci |
| Static compression | 9.6:1 — in the range that usually runs on pump premium |
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