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Ram Hellcat specs: 376 ci (6.2L) 8-cylinder, 4.091 x 3.579 in (103.9 x 90.9 mm) bore and stroke, 9.5:1 compression. Rated 702 hp. Rod ratio and piston speed.
The Ram Hellcat is oversquare — the 4.0906" bore exceeds the 3.5787" stroke by 14.3% — a layout that favors airflow and RPM over leverage at the crank. The 3.5787" 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 47.0 ci (770 cc).
9.5:1 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 10 engines in the Hemi family, sitting between the 345 ci and 392 ci members. Factory fitments include the Ram 1500 TRX.
| Displacement | 376 ci / 6.2 L |
|---|---|
| Bore | 4.0906" |
| Stroke | 3.5787" |
| Cylinders | 8 |
| Compression ratio | 9.5:1 |
| Bore/stroke ratio | 1.143 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 702 hp |
| Bore/stroke character | 1.143 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,579 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 47.0 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
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