L8S 6.6L engine: specs, donor vehicles & swap notes
| Spec | Value |
|---|---|
| RPO | L8S |
| Family | Generation V |
| Years | 2027–present |
| Displacement | 6.6 L / 401 ci |
| Horsepower | 412 hp |
| Torque | 472 lb-ft |
| Bore × stroke | 4.065 × 3.858 in |
| Compression | Not yet published |
| Block | iron |
| AFM/DOD | No |
Iron/Alum. heads, VVT, DI
Specs from secondary sources; GM ratings varied by year and vehicle.
Donor vehicles with the L8S
Where to find one at the junkyard. Confirm with the RPO sticker in the glovebox or the 8th VIN digit.
| Vehicle | Years |
|---|---|
| Chevrolet Silverado HD/GMC Sierra HD | 2027–present |
Next steps
- Find a cam for the L8S
- Compare every LS donor engine
- Size injectors and fuel pump
- Swap guides by vehicle
Sources