Chrysler 318ci specs: 3.91 x 3.313 in (99.3 x 84.2 mm) bore and stroke, shared by all 14 versions. Displacement, compression and factory ratings.
| Displacement | 318 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.910" |
| Stroke | 3.313" |
| Compression | 8.8–9.8:1 |
| Advertised power | 135–230 hp |
| Years | 1978–1999 |
| Cylinder head data | 2 of 14 engines |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| Chrysler 318ci (1988) · 140 hp | 318 ci | 3.91" × 3.313" | 9.801:1 | 140 |
| Chrysler 318ci · 3.910" × 3.313" · 8.801:1 | 318 ci | 3.91" × 3.313" | 8.801:1 | 142–175 |
| Chrysler 318ci · 3.910" × 3.313" · 9.81:1 | 318 ci | 3.91" × 3.313" | 9.81:1 | 140–177 |
| Chrysler 318ci · 3.910" × 3.313" · 8.81:1 | 318 ci | 3.91" × 3.313" | 8.81:1 | 142–175 |
| 318 2-bbl Lean Burn | 318 ci | 3.91" × 3.313" | — | 140 |
| Chrysler 318ci (1978–1980) | 318 ci | 3.91" × 3.313" | — | 135–150 |
| 4-bbl | 318 ci | 3.91" × 3.313" | — | 165–167 |
| 2-bbl | 318 ci | 3.91" × 3.313" | — | 135–150 |
| TBI | 318 ci | 3.91" × 3.313" | — | 170 |
| Magnum 5.2 | 318 ci | 3.91" × 3.313" | — | 220–230 |
| LA 5.2 | 318 ci | 3.91" × 3.313" | — | 170 |
| LA 318 | 318 ci | 3.91" × 3.313" | — | 135–150 |
| LA 318 4-bbl | 318 ci | 3.91" × 3.313" | — | 167 |
| LA 318 EFI | 318 ci | 3.91" × 3.313" | — | 170 |
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.