Tools You'll Need:
* Socket set: You'll likely need a 10mm, possibly also a 7/16" (11mm) socket, depending on the bolts. Always double-check your specific engine.
* Wrench (optional): A wrench can help loosen stubborn bolts, especially if they're corroded.
* Ratchet: Makes the process much faster.
* Extension: May be needed for access to some bolts.
* Shop towels or rags: To clean up any spilled oil.
* A drain pan: A little oil is almost guaranteed to spill.
Procedure:
1. Disconnect the negative battery terminal: This is a crucial safety precaution to prevent accidental shorts.
2. Locate the valve covers: They're the aluminum covers on top of the cylinder heads. They'll have several bolts holding them in place.
3. Loosen the bolts: Use your socket and ratchet (or wrench) to carefully loosen the bolts. Do not remove them completely yet. Loosen them in a star pattern (opposite bolts first, then work your way around) to keep even pressure on the valve cover gasket and prevent warping.
4. Remove the bolts: Once they're loose, fully remove them and set them aside in a safe place (a magnetic parts tray is helpful).
5. Lift off the valve covers: Gently lift the valve cover straight up. There might be some resistance from the gasket, but it should come off relatively easily. If it's stuck, carefully pry it loose using a plastic or wood pry tool; avoid metal tools that could scratch the valve cover or engine.
6. Clean the valve cover and gasket mating surfaces: Use a clean rag or shop towel to remove any old gasket material, dirt, or debris from both the valve cover and the cylinder head. Be careful not to damage the cylinder head's sealing surfaces.
Reassembly (When reinstalling):
1. Install a new gasket: Use a new gasket for each valve cover. Applying a thin bead of high-temperature RTV silicone sealant to the mating surface (following the instructions on the specific gasket you've purchased) can help prevent future leaks.
2. Carefully position the valve cover: Align it properly with the cylinder head.
3. Tighten the bolts: Install the bolts and tighten them in a star pattern, again, to ensure even pressure. Tighten them to the manufacturer's specified torque, which can usually be found in a repair manual specific to your vehicle. If you don't have a torque wrench, tighten them snugly but avoid over-tightening, which could strip the threads or damage the valve cover.
4. Reconnect the negative battery terminal: Once the valve covers are securely in place, reconnect the negative battery terminal.
Important Considerations:
* Oil: Expect some oil spillage. Have a drain pan underneath to catch it.
* Wires and Vacuum Lines: Some wires and vacuum lines might be connected to the valve covers. Carefully disconnect them before removing the valve covers and reconnect them after reinstalling. Take pictures before disconnecting to ensure you put everything back correctly.
* Repair Manual: A Haynes or Chilton repair manual for your specific year and model will provide detailed instructions and torque specifications for your engine. This is highly recommended.
This process is generally the same for most Vortec 350 engines, but minor variations might exist depending on the specific vehicle. Always consult a repair manual for your specific year and model to avoid any potential problems.
