engineExhaust Manifold Torque Specsfor 2021 GMC Sierra 1500 3.0L I6 Duramax Diesel · RWDUnitslb-ftNm11 fastenersSeqComponentTorqueAngle—Cover Bolts13 lb-ft · 18 Nm——Electrical Connector Bolts5 lb-ft · 7 Nm——Exhaust Flange BoltsApply anti-seize | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL33 lb-ft · 45 Nm——Exhaust Manifold NutsApply anti-seize, work hot-to-cold | ⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL22 lb-ft · 30 Nm——Flange BoltsAnti-seize37 lb-ft · 50 Nm——Gasket Surface BoltsClean mating surfaces16 lb-ft · 22 Nm——Hanger Bolts16 lb-ft · 21 Nm——Heat Shield Bolts⚠️ VERIFY SEQUENCE WITH SERVICE MANUAL7 lb-ft · 10 Nm——Mounting Bolts37 lb-ft · 50 Nm——O2 SensorAnti-seize threads37 lb-ft · 50 Nm——Sensor Mounting Bolts8 lb-ft · 11 Nm—📝 Suggest a correction to this torque spec