LM4 5.3L engine: specs, donor vehicles & swap notes
| Spec | Value |
|---|---|
| RPO | LM4 |
| Family | Generation III |
| Years | 2003–2005 |
| Displacement | 5.3 L / 325 ci |
| Horsepower | 290 hp |
| Torque | 325 lb-ft |
| Bore × stroke | 3.78 × 3.622 in |
| Compression | 9.50:1 |
| Block | aluminum |
| AFM/DOD | No |
| VIN 8th digit | P |
Aluminum
Specs from secondary sources; GM ratings varied by year and vehicle.
Donor vehicles with the LM4
Where to find one at the junkyard. Confirm with the RPO sticker in the glovebox or the 8th VIN digit.
| Vehicle | Years |
|---|---|
| Buick Rainier | 2004 |
| Chevrolet SSR | 2003–2004 |
| Chevrolet TrailBlazer EXT | 2003–2005 |
| GMC Envoy XL | 2003–2004 |
| GMC Envoy XUV | 2004 |
| Isuzu Ascender | 2003–2004 |
Next steps
- Find a cam for the LM4
- Compare every LS donor engine
- Size injectors and fuel pump
- Swap guides by vehicle
Sources