General Motors — (84 lb.in.).

A General Motors service procedure — check it applies to your exact model before use.

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Procedure

1. 10. Vacuum line to fuel pressure regulator.
2. 11. Lubricate new O-ring seal on pressure regulator outlet
3. fitting and tighten fitting, careful not to twist regulator.
4. Torque to 17.5 N•m (13 lb.ft.).
5. 12. Inlet fuel line.
6. 13. Negative battery cable.
7. 14. Prime fuel system by cycling key “ON” and “OFF” a few
8. times with engine “OFF.”

Source: manual:5.7L-MEFI-5-Service-Manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.