What is the compressed operating thickness of this gasket?

The compressed operating thickness for this Cometic MLS head gasket is 0.098 inches. This measurement is achieved after the gasket has been properly installed and torqued down.

Do I need to use any sealant with this head gasket?

No, Cometic MLS head gaskets are designed to provide maximum sealing performance on their own and do not require any additional sealants. The Viton coating on the outer layers ensures a strong seal.

What is the difference between the RH and LH head gaskets?

The RH and LH designations refer to the specific cylinder head the gasket is intended for. This is the right-hand (RH) gasket, meaning it is shaped and designed to seal the right bank of cylinders on your 8.1L engine.

Specifications

Brand: Cometic Gasket
Part #: C5761-030
UPC: 191070139438

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

Name: Cometic GM/Mercury 8.1L 496ci 4.280in .030 inch MLS Head Gasket - RH
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-gm-mercury-8-1l-496ci-4-280in-030-inch-mls-head-gasket-rh-t14-415529
Price: 108.99 USD
Availability: BackOrder

$108.99

On Backorder

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Cometic GM/Mercury 8.1L 496ci .030 inch MLS Head Gasket - RH. Multi-layer steel construction with Viton coating for a strong seal.

Key Features

Fits 2001-2007 Chevrolet and GMC 8.1L 496ci vehicles.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are embossed and coated with heat-resistant Viton rubber.
Designed for a 4.280 inch bore and is 0.030 inch undersize.
Requires no additional sealants for installation.
Suitable for aluminum heads to aluminum blocks and aluminum heads to cast iron blocks.

⚠️ 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

This is a Cometic Multi-Layer Steel (MLS) head gasket specifically for GM and Mercury 8.1L 496ci engines. It's designed with a 4.280 inch bore and is 0.030 inches undersize, intended for the right-hand (RH) cylinder head. MLS gaskets are a popular choice for high-output engines because they offer excellent sealing without needing extra sealants, making them suitable for both aluminum-to-aluminum and aluminum-to-cast iron head and block combinations.

Cometic builds these gaskets with multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are coated on both sides with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit and works well in tough sealing environments. The center layer is uncoated stainless steel, and its thickness can be varied to meet different sealing requirements, like this 0.030 inch undersize version.

This gasket fits a range of GM and Mercury trucks and SUVs, including models like the Chevrolet Silverado 2500 HD and GMC Sierra 2500 HD. It's a well-built component designed to provide a reliable seal for your engine rebuild.