See other engines in this family
Land Rover AJ300 specs: 3.0L (183 ci) 6-cylinder, 83 x 92.3 mm (3.2677 x 3.6335 in) bore and stroke. Rated 355-542 hp, 2020–2026.
The Land Rover AJ300 is undersquare — the 3.6335" stroke exceeds the 3.2677" bore by 10.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6335" stroke puts mean piston speed at 4,000 ft/min around 6,600 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.5 ci (500 cc).
It is one of 3 engines in the Land Rover 183ci family, all of them 183 ci — the differences between them are in compression, heads and rating, not displacement. 23 factory variants share these dimensions, rated from 355 to 542 hp across 2020–2026.
| Displacement | 183 ci / 3 L |
|---|---|
| Bore | 3.2677" * |
| Stroke | 3.6335" * |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 10.5–10.6:1 (published figures vary) |
| Bore/stroke ratio | 0.899 |
* Bore and stroke from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 355–542 hp |
| Years | 2020–2026 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2020 | AJ300 net | 355 @ 5500-6500 | 365 lb-ft @ 2000-5000 | 10.5:1 |
| 2020 | AJ300 net | 395 @ 5500-6500 | 406 lb-ft @ 2000-5000 | 10.5:1 |
| 2021 | AJ300 net | 355 @ 5500-6500 | 365 lb-ft @ 2000-5000 | 10.5:1 |
| 2021 | AJ300 net | 395 @ 5500-6500 | 406 lb-ft @ 2000-5000 | 10.5:1 |
| 2022 | AJ300 net | 355 @ 5500-6500 | 365 lb-ft @ 2000-5000 | 10.5:1 |
| 2022 | AJ300 net | 395 @ 5500-6500 | 406 lb-ft @ 2000-5000 | 10.5:1 |
| 2023 | AJ300 net | 355 @ 5500-6500 | 365 lb-ft @ 2000-5000 | 10.5:1 |
| 2023 | AJ300 net | 395 @ 5500-6500 | 406 lb-ft @ 2000-5000 | 10.5:1 |
| 2023 | AJ300 | 434 | 457 lb-ft | 10.5:1 |
| 2024 | AJ300 net | 355 @ 5500-6500 | 365 lb-ft @ 2000-5000 | 10.5:1 |
| 2024 | AJ300 net | 395 @ 5500-6500 | 406 lb-ft @ 2000-5000 | 10.5:1 |
| 2024 | AJ300 | 542 @ 5500-6500 | 590 lb-ft | 10.6:1 |
| 2025 | AJ300 net | 355 @ 5500-6500 | 365 lb-ft @ 2000-5000 | 10.5:1 |
| 2025 | AJ300 net | 395 @ 5500-6500 | 406 lb-ft @ 2000-5000 | 10.5:1 |
| 2025 | AJ300 | 542 @ 5500-6500 | 590 lb-ft | 10.6:1 |
| 2026 | AJ300 net | 355 @ 5500-6500 | 365 lb-ft @ 2000-5000 | 10.5:1 |
| 2026 | AJ300 net | 395 @ 5500-6500 | 406 lb-ft @ 2000-5000 | 10.5:1 |
| 2026 | AJ300 | 542 @ 5500-6500 | 590 lb-ft | 10.6:1 |
Factory specification sheet.
| Bore/stroke character | 0.899 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,634 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 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 |
|---|---|---|
| 2020 | 355 hp | AJ300 |
| 2020 | 395 hp | AJ300 |
| 2021 | 355 hp | AJ300 |
| 2021 | 395 hp | AJ300 |
| 2022 | — | AJ300 |
| 2022 | 355 hp | AJ300 |
| 2022 | 395 hp | AJ300 |
| 2023 | — | AJ300 |
| 2023 | 355 hp | AJ300 |
| 2023 | 395 hp | AJ300 |
| 2023 | 434 hp | AJ300 |
| 2024 | — | AJ300 |
| 2024 | 355 hp | AJ300 |
| 2024 | 395 hp | AJ300 |
| 2024 | 542 hp | AJ300 |
| 2025 | — | AJ300 |
| 2025 | 355 hp | AJ300 |
| 2025 | 395 hp | AJ300 |
| 2025 | 542 hp | AJ300 |
| 2026 | — | AJ300 |
| 2026 | 355 hp | AJ300 |
| 2026 | 395 hp | AJ300 |
| 2026 | 542 hp | AJ300 |
3 factory vehicles, 2020–2026. Each year opens that model's engine table.