What size bolt is a LS valve cover?
When working on an LS engine, one of the common questions that arises is about the size of the bolts used for the valve cover. Whether you're replacing a gasket, upgrading to aftermarket covers, or simply performing routine maintenance, knowing the correct bolt size is crucial for a smooth and efficient repair process. In this article, we'll provide a detailed answer to this question and offer some tips for handling LS valve cover bolts.
The Standard Bolt Size for LS Valve Covers
The bolts used for LS valve covers are typically M6 x 1.0. This means the bolt has a 6mm diameter with a thread pitch of 1.0mm. The length of the bolts can vary depending on the specific LS engine model and whether you're using stock or aftermarket valve covers. For most stock LS engines, the bolt length is usually around 25mm to 30mm.
Why Knowing the Correct Bolt Size Matters
Using the correct bolt size is essential for several reasons:
- Proper Fit: The right bolt size ensures a secure fit, preventing leaks and maintaining the integrity of the valve cover seal.
- Avoiding Damage: Incorrect bolt sizes can strip threads or damage the valve cover, leading to costly repairs.
- Efficient Repairs: Having the correct bolts on hand saves time and effort during maintenance or upgrades.
Tips for Handling LS Valve Cover Bolts
Here are some tips to keep in mind when working with LS valve cover bolts:
- Use a Torque Wrench: Always tighten the bolts to the manufacturer's recommended torque specification, which is typically around 8-10 Nm (Newton-meters) for LS valve covers.
- Inspect Threads: Before reinstalling bolts, check the threads for any damage or debris that could affect their performance.
- Consider Upgrades: If you're frequently working on your LS engine, consider upgrading to aftermarket valve cover bolts with built-in washers for added durability and ease of use.
- Keep Spares: It's always a good idea to have spare M6 x 1.0 bolts in your toolbox in case you lose or damage one during a repair.
Conclusion
In summary, the standard bolt size for LS valve covers is M6 x 1.0, with a typical length of 25mm to 30mm for stock applications. Ensuring you have the correct bolts and following proper installation practices will help maintain the performance and reliability of your LS engine. If you have any questions or need assistance with your LS engine, feel free to reach out to us at Kevin's Autos for expert advice and service!
Frequently Asked Questions
When did Chevy go to Center bolt valve cover?
In 1987, another round of changes were made, this time to the top of the engine. Engine now has Center Bolt valve covers (Figure D), and the intake manifold bolt angle has changed on the four center intake bolts, thus making all previous intakes not applicable to the 1987-1997 Engines.
How long are SBC valve cover bolts?
1/4" coarse thread X 5/8" long will usually do it. 1/4"-20 For length measure the thickness of the valve cover, the gasket you plan to use, and the washer under the head.
Are Vortec heads center bolt?
The Vortec heads use center-bolt valve covers, and the bolt pattern and angle of the intake manifold surface are different.
What size bolts for LS front cover?
M8 x 30mm
This M8 x 30mm long bolt is used in multiple locations on LS-series engines. 8 bolts required for the timing cover.
What do you torque LS valve covers to?
Evenly torque each valve cover retention bolt to 106 in/lb (9 ft/lb). 4. Reinstall any components that were removed or altered during installation. Make sure all electrical connections are secure, and reconnect the battery.
How many times can you reuse a valve cover gasket?
You can reuse once or twice. Just put some red rtv on the half moons and seam on the right side (driver, looking at it).
Do valve cover bolts need sealant?
Some covers use the valve cover bolts/grommets to help hold the gasket in the cover groove. No need for sealers or adhesives to “glue in” the gasket.
Which bolts Cannot be reused?
“Reuse: ASTM A490 bolts and galvanized ASTM A325 bolts shall not be reused. When approved by the Engineer of Record, plain finish ASTM A325 bolts are permitted to be reused.
What size are LS head bolts?
Installation Process
| LS Cylinder Head Torque Specs | ||
|---|---|---|
| Engine Family | Bolt Size | Final Pass |
| Gen. 3 (LS1, LS6, etc.) | M11 x 101mm | 50 degrees |
| M8 x 46mm | 22 ft.-lbs. | |
| Gen. 4 (LS2, LS3, etc.) | M11 x 155.5mm | 70 degrees |
Can you reuse valve cover bolts?
The bolts that need to be replaced are the ones that have been stretched during assembly and they are generally the bolts that hold the head. For valve cover, you only need to replace the rubber-like, orings.
