LS4 5.3L engine: specs, donor vehicles & swap notes
| Spec | Value |
|---|---|
| RPO | LS4 |
| Family | Generation IV |
| Years | 2005–2009 |
| Displacement | 5.3 L / 325 ci |
| Horsepower | 300–303 hp |
| Torque | 323 lb-ft |
| Bore × stroke | 3.78 × 3.622 in |
| Compression | 10.00:1 |
| Block | aluminum |
| AFM/DOD | Yes |
Aluminum, AFM, FWD
Specs from secondary sources; GM ratings varied by year and vehicle.
Donor vehicles with the LS4
Where to find one at the junkyard. Confirm with the RPO sticker in the glovebox or the 8th VIN digit.
| Vehicle | Years |
|---|---|
| Buick LaCrosse Super | 2008–2009 |
| Chevrolet Impala SS | 2006–2009 |
| Chevrolet Monte Carlo SS | 2006–2007 |
| Pontiac Grand Prix GXP | 2005–2008 |
Next steps
- Find a cam for the LS4
- Compare every LS donor engine
- Size injectors and fuel pump
- Swap guides by vehicle
Sources