Grand Prix V6-191 3.1L VIN M SFI (1998)
Intake Manifold: Specifications
Upper Intake Manifold Torque and Sequence
Install the upper intake manifold bolts and studs. Apply threadlock GM P/N 12345382 or equivalent to the threads.
Tighten the upper intake manifold bolts and studs to 25 Nm (18 ft. lbs.).