What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic MLS head gasket is 0.066 inches. This specific thickness is important for achieving the correct compression ratio in your engine.

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

No, this Cometic MLS head gasket is designed to provide maximum sealing performance and does not require any additional sealants. The Viton coating on the outer layers ensures a tight seal on its own.

What kind of engines is this head gasket designed for?

This head gasket is built for high-output GM and Mercury 8.1L 496ci engines, often found in heavy-duty trucks and SUVs. Its robust construction helps it withstand the demands of these powerful applications.

Specifications

Brand: Cometic Gasket
Part #: C5765-066
UPC: 191070076917

Cometic GM / Mercury 8.1L 496ci 4.350in Bore .066in MLS-5 LH Head Gasket

Name: Cometic GM / Mercury 8.1L 496ci 4.350in Bore .066in MLS-5 LH Head Gasket
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-gm-mercury-8-1l-496ci-4-350in-bore-066in-mls-5-lh-head-ga-t14-193096
Price: 152.35 USD
Availability: BackOrder

$152.35

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Cometic GM 8.1L 496ci MLS head gasket with a 4.350in bore. Designed for high output engines and requires no sealants.

Key Features

Fits a wide range of GM and Mercury 8.1L 496ci engines, including Chevrolet and GMC trucks and SUVs.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are coated with heat-resistant Viton for reliable sealing.
Designed for high-output engines and requires no additional sealants.
Features a 4.350-inch bore and a compressed thickness of 0.066 inches.
Suitable for use with both aluminum and cast iron engine 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 designed for GM and Mercury 8.1L 496ci engines. It features a 4.350-inch bore and a compressed thickness of 0.066 inches, making it suitable for a range of heavy-duty trucks and SUVs like the Chevrolet Silverado 2500 HD and GMC Sierra 3500.

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°F (250°C) and works well with both aluminum and cast iron blocks. This construction means the gasket seals effectively without needing any additional sealants, which is a big help when you're working on high-output engines where sealing is critical.