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Ram Hemi 6.4 specs: 392 ci (6.4L) 8-cylinder, 4.091 x 3.724 in (103.9 x 94.6 mm) bore and stroke. Rated 405-410 hp, 2014–2026. Used in the Ram 2500 and 3500.
The Ram Hemi 6.4 is oversquare — the 4.0906" bore exceeds the 3.7244" stroke by 9.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.7244" stroke puts mean piston speed at 4,000 ft/min around 6,450 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 49.0 ci (803 cc).
It is one of 10 engines in the Hemi family, the largest at 392 ci. 13 factory variants share these dimensions, rated from 405 to 410 hp across 2014–2026.
| Displacement | 392 ci / 6.4 L |
|---|---|
| Bore | 4.0906" |
| Stroke | 3.7244" |
| Cylinders | 8 |
| Configuration | V8 |
| Bore/stroke ratio | 1.098 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | OHV |
| Fuel type | gas |
| Advertised HP | 405–410 hp |
| Years | 2014–2026 |
| Bore/stroke character | 1.098 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,724 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 49.0 ci |
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 |
|---|---|---|
| 2014 | 410 hp | Hemi 6.4 |
| 2015 | 410 hp | Hemi 6.4 |
| 2016 | 410 hp | Hemi 6.4 |
| 2017 | 410 hp | Hemi 6.4 |
| 2018 | 410 hp | Hemi 6.4 |
| 2019 | 410 hp | Hemi 6.4 |
| 2020 | 410 hp | Hemi 6.4 |
| 2021 | 410 hp | Hemi 6.4 |
| 2022 | 410 hp | Hemi 6.4 |
| 2023 | 410 hp | Hemi 6.4 |
| 2024 | 410 hp | Hemi 6.4 |
| 2025 | 405 hp | Hemi 6.4 |
| 2026 | 405 hp | Hemi 6.4 |