Always verify with your owner's manual or service manual for your exact model year.
| Engine | Years | Torque | Notes |
|---|---|---|---|
| 2.5L I4 (LKW) | 2015–2022 | 15 ft-lb (20 Nm) | Aluminum head; use torque wrench |
| 2.8L Duramax Diesel (LWN) | 2016–2022 | 33 ft-lb (45 Nm) | Glow plugs different; this is for glow plug? Wait—diesel has glow plugs, not spark plugs. Correction: 2.8L diesel uses glow plugs, not spark plugs. Torque for glow plugs: 18 ft-lb (25 Nm). Original source likely mislabeled. |
| 3.5L I5 (L52) | 2004–2006 | 31 ft-lb (42 Nm) | Iron head; anti-seize on threads |
| 3.6L V6 (LGZ/LFX) | 2007–2022 | 15 ft-lb (20 Nm) | Aluminum head; critical not to over-torque |
| 5.3L V8 (LH8/LH9) | 2009–2012 | 15 ft-lb (20 Nm) | Aluminum head |
Diesel note: 2.8L has glow plugs, not spark plugs. Confirm component.