LM7 5.3L engine: specs, donor vehicles & swap notes
| Spec | Value |
|---|---|
| RPO | LM7 |
| Family | Generation III |
| Years | 1999–2007 |
| Displacement | 5.3 L / 325 ci |
| Horsepower | 270–295 hp |
| Torque | 315–335 lb-ft |
| Bore × stroke | 3.78 × 3.622 in |
| Compression | 9.49:1 |
| Block | iron |
| AFM/DOD | No |
| VIN 8th digit | T |
| Stock cam | 190/191 duration,.466/.457 lift, 114 LSA, 112/116 timing. |
Iron/Alum. heads
Specs from secondary sources; GM ratings varied by year and vehicle.
Donor vehicles with the LM7
Where to find one at the junkyard. Confirm with the RPO sticker in the glovebox or the 8th VIN digit.
| Vehicle | Years |
|---|---|
| Cadillac Escalade 2WD | 2002–2005 |
| Chevrolet Avalanche 1500 | 2002–2006 |
| Chevrolet Express/GMC Savana 1500/2500 | 2003–2007 |
| Chevrolet Silverado/GMC Sierra 1500 (and 1999–2000 2500) | 1999–2007 |
| Chevrolet Suburban/GMC Yukon XL 1500 | 2000–2006 |
| Chevrolet Tahoe/GMC Yukon | 2000–2006 |
Next steps
- Find a cam for the LM7
- Compare every LS donor engine
- Size injectors and fuel pump
- Swap guides by vehicle
Questions about the LM7
Sources