engineCylinder Head R&R Torque Specsfor 2012 GMC Sierra 2500HD 6.6L V8 Duramax Diesel · 4WDUnitslb-ftNm9 fastenersSeqComponentTorqueAngle—Cover Bolts16 lb-ft · 22 Nm——Cylinder Head Bolts (M12)Critical1) 37 lb-ft. 2) 59 lb-ft. 3) +60 degrees. 4) +60 degrees.37 lb-ft · 50 Nm120°—Cylinder Head Bolts (M8)CriticalTighten small bolts to 18 lb-ft last.18 lb-ft · 25 Nm——Electrical Connector Bolts7 lb-ft · 9 Nm——Gasket BoltsCritical15 lb-ft · 20 Nm——Gasket Surface BoltsCriticalClean mating surfaces20 lb-ft · 27 Nm——Mounting BoltsCritical47 lb-ft · 64 Nm——Sensor Bolts8 lb-ft · 11 Nm——Sensor Mounting Bolts11 lb-ft · 15 Nm—📝 Suggest a correction to this torque spec