Bore, stroke, displacement and compression for all 16 Dodge Gen III Hemi engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 345–392 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.917–4.091" |
| Stroke | 3.579–3.724" |
| Compression | 8.5–10.9:1 |
| Advertised power | 335–1025 hp |
| Years | 2004–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 6.4L Hemi (392 Apache) | 392 ci | 4.0906" × 3.7244" | 10.9:1 | 470 |
| 392 Hemi | 392 ci | 4.0906" × 3.7244" | — | 475 |
| 6.2L Hemi Supercharged (Hellcat) | 376 ci | 4.0906" × 3.5787" | 9.5:1 | 707 |
| 6.2L Hemi Supercharged (Demon) | 376 ci | 4.0906" × 3.5787" | 8.5:1 | 808 |
| 6.2L Hemi Supercharged (Redeye) | 376 ci | 4.0906" × 3.5787" | 10.8:1 | 797 |
| ESD | 376 ci | 4.0906" × 3.5787" | — | 707–1025 |
| Hellcat 6.2 | 376 ci | 4.0906" × 3.5787" | — | 710 |
| Gen III Hemi (2021–2024) | 376 ci | 4.0906" × 3.5787" | — | 702 |
| 6.1L Hemi | 370 ci | 4.0551" × 3.5787" | 10.3:1 | 425 |
| ESF | 370 ci | 4.0551" × 3.5787" | — | 425 |
| SRT 6.1 | 370 ci | 4.0551" × 3.5787" | — | 425 |
| Gen III Hemi · 3.917" × 3.579" · 10.5:1 | 345 ci | 3.9173" × 3.5787" | 10.5:1 | 340–360 |
| EZD | 345 ci | 3.9173" × 3.5787" | — | 368 |
| Hemi 5.7 | 345 ci | 3.9173" × 3.5787" | — | 335–360 |
| Hemi 5.7 VVT | 345 ci | 3.9173" × 3.5787" | — | 376 |
| Hemi 5.7 Hybrid | 345 ci | 3.9173" × 3.5787" | — | 385 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 8.5:1 to 10.9:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.