What is the compressed thickness of this head gasket?

This Cometic MLS head gasket has a compressed operating thickness of 0.098 inches. This measurement is crucial for ensuring proper valve-to-piston clearance and compression ratios after installation.

Does this gasket require any sealant?

No, Cometic MLS head gaskets are designed to provide maximum sealing performance without the need for additional sealants. The multi-layer steel construction and Viton coating create a robust seal on their own.

What does the '.030 inch' in the product name mean?

The '.030 inch' indicates that this gasket is 0.030 inches undersize compared to a standard gasket. This is often used during engine rebuilds when cylinder heads or blocks have been machined or resurfaced.

Specifications

Brand: Cometic Gasket
Part #: C5764-030
UPC: 191070139582

Cometic GM/Mercury 8.1L 496ci 4.280in .030 inch MLS Head Gasket - LH

Name: Cometic GM/Mercury 8.1L 496ci 4.280in .030 inch MLS Head Gasket - LH
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-gm-mercury-8-1l-496ci-4-280in-030-inch-mls-head-gasket-lh-t14-415530
Price: 108.99 USD
Availability: BackOrder

$108.99

On Backorder

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Cometic is known for well-built gaskets. This MLS head gasket fits GM/Mercury 8.1L 496ci engines and is .030 inch undersize.

Key Features

Fits 2001-2007 Chevrolet and GMC 8.1L 496ci vehicles.
Multi-Layer Steel (MLS) construction offers increased strength and rebound resistance.
Outer layers are coated with heat-resistant Viton rubber, rated up to 482°F (250°C).
Designed for aluminum heads to aluminum or cast iron blocks.
Compressed operating thickness is 0.098 inches.
Features a 4.280 inch bore size and is .030 inch undersize.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

Cometic Gasket has a reputation for making well-built sealing components, and this Multi-Layer Steel (MLS) head gasket is a prime example. It’s designed for GM and Mercury 8.1L 496ci engines, specifically the left-hand (LH) side, and comes at a .030 inch undersize to help with engine rebuilds. This gasket fits a range of heavy-duty trucks and SUVs, including models like the Chevrolet Silverado 2500 HD and GMC Sierra 3500.

This MLS gasket is built with multiple layers of stainless steel for increased strength and the ability to rebound, which helps it resist corrosion and maintain a strong seal. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F (250°C) and works well in harsh sealing environments, even with different surface finishes. The center layer is uncoated stainless steel and can be varied to achieve different compressed thicknesses, with this particular gasket having a compressed operating thickness of 0.098 inches. Because it's an MLS design, it doesn't require any additional sealants and is suitable for mating aluminum heads to either aluminum or cast iron blocks, handling the shearing forces that can occur between dissimilar metals.