What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic MLS head gasket is 0.027 inches. This specific thickness is important for achieving the correct compression ratio and valve-to-piston clearance in your engine.

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

No, Cometic Multi-Layer Steel (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 tight seal.

What is Viton and why is it used on this gasket?

Viton is a type of heat-resistant rubber material that can withstand high temperatures, up to 482°F (250°C). It's used on the outer layers of this gasket to create a robust seal that can handle the demanding conditions found in high-output engines.

Specifications

Brand: Cometic Gasket
Part #: C5674-027
UPC: 191070085735

Cometic AMC 290/304/343/360 4.140in Bore .027inch MLS Head Gasket

Name: Cometic AMC 290/304/343/360 4.140in Bore .027inch MLS Head Gasket
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-amc-290-304-343-360-4-140in-bore-027inch-mls-head-gasket-t14-481288
Price: 106.53 USD
Availability: BackOrder

$106.53

On Backorder

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Cometic MLS head gasket for AMC 290/304/343/360 V8 engines. Features Viton coating and 4.140in bore.

Key Features

Fits 23+ vehicle make/model combinations including American Motors AMX, Ambassador, Javelin, Matador, and Jeep Cherokee, J10, J20, and Wagoneer models.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are coated with Viton, a heat-resistant elastomer rated up to 482°F (250°C).
Designed for a 4.140-inch bore size.
Compressed gasket thickness is 0.027 inches.
Requires no additional sealants for installation.

⚠️ 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 designed for AMC 290, 304, 343, and 360 cubic inch V8 engines. It features a 4.140-inch bore and a compressed thickness of 0.027 inches, making it suitable for a range of classic American Motors and Jeep vehicles from the late 60s through the early 90s.

MLS head gaskets are built with multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers of this gasket are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit. This coating ensures a strong seal without the need for additional sealants, even when mating aluminum heads to cast iron blocks. The center layer is stainless steel and can be varied to achieve different thicknesses, like the 0.027 inches specified here.

This gasket is a solid option for rebuilding or repairing the top end of your AMC V8. It’s designed to handle the demands of higher output engines and provides a reliable seal in various operating conditions.