Bore, stroke, displacement and compression for all 8 Jeep 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 | 3.579–3.720" |
| Compression | 10.5–10.9:1 |
| Advertised power | 330–475 hp |
| Years | 2005–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| ESG | 392 ci | 4.0906" × 3.7205" | 10.9:1 | 470 |
| ESG | 392 ci | 4.0906" × 3.7205" | — | 470–475 |
| HEMI (2021–2026) | 392 ci | 4.0906" × 3.7205" | — | 470 |
| EZH | 345 ci | 3.9173" × 3.5787" | 10.5:1 | 360 |
| Hemi 5.7 | 345 ci | 3.9173" × 3.5787" | — | 330 |
| Hemi 5.7 VVT | 345 ci | 3.9173" × 3.5787" | — | 357 |
| EZH | 345 ci | 3.9173" × 3.5787" | — | 360 |
| EZL | 345 ci | 3.9173" × 3.5787" | — | 357 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
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.