SOURCE: Torque Spec for '99 Chevy C1500 5.7L engine lower intake manifold
On 5.7L engines, install the bolts and torque in sequence as follows:
SOURCE: What is the torque spes
For 2004 Chevrolet Truck Silverado 2500HD 4WD 6.0L SFI 8cyl, the intake manifold, throttle body, fuel injection rail, and fuel
injectors may be removed as an assembly. If not servicing the individual
components, remove the manifold as a complete assembly.
Intake manifold bolts. Tighten intake manifold bolts first pass in
sequence to 44 inch lbs. (5 Nm). Tighten intake manifold bolts final
pass in sequence to 89 inch lbs. (10 Nm).
Fig. Lower intake manifold bolt tightening sequence - 4.8L, 5.3L and 6.0L engines
Hope this helps.
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