What size bolt is a LS valve cover?
The standard bolt size for a LS (Gen III/IV) valve cover is 8mm. This is a common size used on many General Motors engines, including the popular LS-series V8 engines found in a variety of Chevrolet, Cadillac, and other GM vehicles.
Detailed Explanation
The LS valve cover is a critical component that covers the cylinder heads on LS-series engines. It protects the valve train components and helps maintain proper oil flow throughout the engine. Securing the valve cover to the cylinder heads requires a specific bolt size and torque specification to ensure a proper seal and prevent leaks.
The LS valve cover is typically held in place by a series of 8mm bolts, which are the most common size used on these engines. The exact number of bolts can vary depending on the specific engine model, but is usually between 8-12 bolts per valve cover.
- The standard bolt size for LS valve covers is 8mm in diameter.
- The bolt length can vary, but is typically between 25-35mm long.
- The bolts should be tightened to the manufacturer's specified torque, usually around 18-22 ft-lbs.
- Using the correct bolt size and torque is important to maintain a proper seal and prevent oil leaks.
Proper valve cover bolt installation is a critical step when servicing or modifying LS-series engines. Using the wrong bolt size or improper torque can lead to leaks, damage, and potentially serious engine issues. Always refer to the specific service information for your engine when replacing or tightening the valve cover bolts.
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.
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 |
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.
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.
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.
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.
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.
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.
