Importance of Correct Torque

Properly torquing valve cover bolts is essential for preventing leaks and ensuring optimal engine performance. Overtightening can damage the valve covers or gaskets, while undertightening can lead to leaks.

Recommended Torque Values

Torque specifications for Chevy 350 valve covers vary depending on the head style and the use of studs with nylon insert nuts. The following values are provided as general guidelines:

• Official Spec Charts:
  • 25 inch-pounds (for Aluminum Heads)
  • 60 inch-pounds (for Cast Iron Heads)
• Recommended by Summit:
  • 45 inch-pounds

Step-by-Step Guide to Tightening Valve Cover Bolts

1. Clean the mating surfaces: Remove any dirt or debris from the valve covers and the cylinder heads.
2. Apply sealant (optional): If desired, apply a thin layer of sealant to the side of the gaskets facing the cylinder heads.
3. Position the valve covers: Carefully align the valve covers with the cylinder heads and place them in position.
4. Hand-tighten the bolts: Use your fingers to thread the valve cover bolts into the cylinder heads.
5. Tighten the bolts in sequence: Using a torque wrench, gradually tighten the bolts in the specified sequence. Refer to your engine manual for the recommended tightening pattern.
6. Double-check the torque: Once all bolts are tightened, go back and double-check the torque using the torque wrench.

Troubleshooting Persistent Leaks

If you experience leaks after tightening the valve cover bolts, consider the following:

• Warped valve covers: Check if the valve covers are warped by placing them on a flat surface. If there are any gaps, they will need to be replaced or repaired.
• Damaged gaskets: Inspect the gaskets for any tears or damage. Replace any damaged gaskets.
• Overtightened bolts: If the bolts were overtightened, the gaskets may be damaged. Check the torque and re-tighten the bolts to the specified values.
• Incorrect torque specifications: Ensure that you are using the correct torque specifications for your specific engine and head configuration. Consult your engine manual or a qualified mechanic for the most accurate information.

FAQ: Chevy 350 Valve Cover Torque Specs

What type of gasket is recommended for Chevy 350 valve covers?

Cork gaskets are recommended for sealing valve covers.

Should I use sealant on the valve cover gaskets?

Sealer is optional but can help prevent leaks. If used, apply it only to the side facing the head, not the valve cover.

Do aluminum valve covers with raised sealing areas require additional sealant?

The raised areas may provide adequate sealing on their own, eliminating the need for additional sealant.

What is the correct torque for Chevy 350 valve cover bolts?

Official spec charts recommend either 25 or 60 inch-pounds. However, 45 inch-pounds is also a common recommendation.

Does the head style affect the torque specifications?

Yes, torque specifications may vary depending on the head style. However, the specific head style associated with each torque setting is not provided in this information.

Do studs with nylon insert nuts change the torque specifications?

Yes, but the extent of the modification is not specified in this information.

What should I do if leaks persist after applying sealant?

Re-check the valve cover flatness or have it professionally inspected, as warped valve covers can cause uneven sealing.

Note: For the most accurate and up-to-date torque specifications, consult the engine manufacturer or a qualified mechanic.