What is the compressed thickness of this head gasket?

This Cometic MLS head gasket has a compressed operating thickness of 0.066 inches. This specific thickness is important for achieving the correct compression ratio in your AMC 390 or 401 engine.

Do I need to use any sealant with this gasket?

No, Cometic MLS head gaskets are designed to provide maximum sealing performance without the need for additional sealants. The Viton coating on the outer layers ensures a tight seal against the engine block and cylinder head.

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 meet the demands of harsh sealing environments and ensure a durable seal on your AMC V8 engine.

Specifications

Brand: Cometic Gasket
Part #: C5938-066
UPC: 191070431778

Cometic AMC 390/401 Gen-3 V8 .066in MLS Cylinder Head Gasket - 4.380in Bore

Name: Cometic AMC 390/401 Gen-3 V8 .066in MLS Cylinder Head Gasket - 4.380in Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-amc-390-401-gen-3-v8-066in-mls-cylinder-head-gasket-4-380-t14-807060
Price: 151.73 USD
Availability: BackOrder

$151.73

On Backorder

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

Cometic AMC 390/401 Gen-3 V8 .066in MLS Cylinder Head Gasket - 4.380in Bore. This multi-layer steel gasket offers improved sealing for high-output engines.

Key Features

Fits American Motors AMX, Ambassador, Javelin, Matador, Rambler, Rebel, and Jeep Cherokee, J10, J20, Wagoneer models.
Multi-layer steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are coated with Viton, a heat-resistant elastomer, for reliable sealing.
Designed for AMC 390 and 401 Gen-3 V8 engines.
Features a 4.380 inch bore size.
Compressed operating thickness is 0.066 inches.

⚠️ 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) cylinder head gasket designed for AMC 390 and 401 Gen-3 V8 engines. It features a 4.380 inch bore and a compressed thickness of 0.066 inches, making it suitable for a range of American Motors and Jeep vehicles from the late 60s through the late 70s, like the AMX, Ambassador, and Jeep Cherokee.

MLS head gaskets are built with multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle tough sealing environments and various surface finishes without needing additional sealants. This construction is ideal for engines using aluminum heads with either aluminum or cast iron blocks, as it can manage the shearing forces between different metals. The center layer is stainless steel and can be varied to achieve different gasket thicknesses.