1. Remove the fuel feed hose. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls - 5.7 L.
2. Disconnect the generator electrical connector (1).
3. Remove the engine wiring harness generator lead nut (3) and lead.



4. Remove the secondary air injection (AIR) hose clamp.
5. Disconnect the AIR hose (3) from the check valve.



6. If equipped with the regular production option (RPO) LS1 engine, remove the positive crankcase ventilation (PCV) valve pipe from the left rocker cover.



7. Disconnect the spark plug wires from the ignition coils.

•	Twist the spark plug wire boot 1/2 turn.

•	Pull only on the boot in order to remove the wire from the ignition coil.

8. Disconnect the ignition coil wire harness main electrical connector.



9. Remove the evaporative emission (EVAP) canister purge tube from the intake manifold.
10. Remove the EVAP canister purge tube from the EVAP canister purge solenoid valve.
11. Remove the EVAP canister purge tube.



12. Disconnect the EVAP canister purge tube from the EVAP canister purge solenoid valve.
13. Disconnect the EVAP canister purge tube from the fuel feed pipe.
14. Remove the EVAP canister purge tube.



15. Disconnect the EVAP canister purge solenoid valve electrical connector (2).



16. Remove the EVAP canister purge solenoid valve from the bracket.



17. Remove the ignition coil bracket studs.
18. Remove the ignition coil bracket.



19. Loosen the valve rocker arm cover bolts.
20. Remove the valve rocker cover.



21. Remove the gasket (1) from the rocker cover. Discard the OLD gasket.
22. Clean and inspect the rocker arm cover. Refer to Valve Rocker Arm Cover Cleaning and Inspection in Engine Mechanical-5.7L Unit Repair.

Important: 

1. Install a NEW rocker cover gasket (1) into the valve rocker cover lip.



2. Install the valve rocker arm cover.

Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

3. Tighten the valve rocker cover bolts.

Tighten
Tighten the valve rocker arm cover bolts to 12 N·m (106 lb in).




4. Install the ignition coil bracket.
5. Apply threadlock GM U.S. P/N 12345382, Canada P/N 10953489, or equivalent to the threads of the ignition coil bracket studs.
6. Install the ignition coil bracket studs.

Tighten
Tighten the ignition coil bracket studs to 12 N·m (106 lb in).




7. Remove the EVAP canister purge solenoid valve from the bracket.



8. Connect the EVAP canister purge solenoid valve electrical connector (2).



9. Disconnect the EVAP canister purge tube from the EVAP canister purge solenoid valve.
10. Disconnect the EVAP canister purge tube from the fuel feed pipe.
11. Remove the EVAP canister purge tube.



12. Remove the evaporative emission (EVAP) canister purge tube from the intake manifold.
13. Remove the EVAP canister purge tube from the EVAP canister purge solenoid valve.
14. Remove the EVAP canister purge tube.



15. Connect the ignition coil wire harness main electrical connector.
16. Install the spark plug wires to the ignition coils.



17. If equipped with the RPO LS1 engine, install the PCV valve pipe to the left rocker cover.



18. Connect the AIR hose (3) to the check valve.
19. Install the AIR hose clamp.



20. Connect the generator electrical connector (1).
21. Install the engine wiring harness generator lead and nut (3).

Tighten
Tighten the engine wiring harness generator lead nut to 13 N·m (115 lb in).

22. Install the fuel feed hose. Refer to Fuel Hose/Pipes Replacement - Engine Compartment in Engine Controls - 5.7 L.