engine

Cylinder Head Resurface Torque Specs

for 2023 GMC Sierra 2500HD 6.6L V8 Duramax Diesel · 4WD

Units

14 fasteners

Seq

Component

Torque

Angle

—

Cover Bolts

16 lb-ft · 22 Nm

—

Cover Bolts

12 lb-ft · 16 Nm

—

Cylinder Head Bolts

Critical

TTY - tighten in sequence plus angle

48 lb-ft · 65 Nm

—

Electrical Connector Bolts

7 lb-ft · 9 Nm

—

Exhaust Manifold Nuts

Critical

Apply anti-seize, work hot-to-cold

22 lb-ft · 30 Nm

—

Gasket Bolts

Critical

15 lb-ft · 20 Nm

—

Gasket Surface Bolts

Critical

Clean mating surfaces

20 lb-ft · 27 Nm

—

Intake Manifold Bolts

Critical

18 lb-ft · 25 Nm

—

Mounting Bolts

Critical

35 lb-ft · 47 Nm

—

Mounting Bolts

Critical

47 lb-ft · 64 Nm

—

Mounting Bolts

20 lb-ft · 27 Nm

—

Sensor Bolts

8 lb-ft · 11 Nm

—

Sensor Mounting Bolts

11 lb-ft · 15 Nm

—

Valve Cover Bolts

Tighten in sequence

7 lb-ft · 10 Nm

—

2023 GMC SIERRA 2500HD

14 fasteners