What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic head gasket is 0.040 inches. This measurement is important for ensuring proper compression ratios and valve-to-piston clearance.

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

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 is Viton and why is it used on this gasket?

Viton is a heat-resistant synthetic rubber material used to coat the outer layers of the gasket. It's chosen for its ability to withstand high temperatures (up to 482°F) and harsh sealing environments, ensuring a durable seal under demanding conditions.

Specifications

Brand: Cometic Gasket
Part #: C5457-040
UPC: 191070017507

Cometic Chrysler 318/340/360 4.125in Bore .040in MLS Head Gasket

Name: Cometic Chrysler 318/340/360 4.125in Bore .040in MLS Head Gasket
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chrysler-318-340-360-4-125in-bore-040in-mls-head-gasket-t14-374158
Price: 97.74 USD
Availability: BackOrder

$97.74

On Backorder

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

Cometic Chrysler 318/340/360 .040in MLS head gasket, 4.125in bore. Built with multiple stainless steel layers and Viton coating for a strong seal.

Key Features

Fits 93+ vehicle make/model combinations.
Multi-Layer Steel (MLS) construction for increased strength and corrosion resistance.
Outer layers are embossed and coated with heat-resistant Viton rubber.
Compressed operating thickness is 0.040 inches.
Bore size is 4.125 inches.
No sealants required 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 Cometic Multi-Layer Steel (MLS) head gasket is built with multiple embossed layers of stainless steel, featuring an outer layer coated with Viton rubber. The compressed operating thickness is .040 inches, and the bore is 4.125 inches, making it suitable for Chrysler 318, 340, and 360 LA-series V8 engines. MLS gaskets are known for their ability to handle high output engines and don't require any additional sealants, providing a maximum sealing performance whether you're pairing aluminum heads with aluminum blocks or aluminum heads with cast iron blocks. They are designed to withstand the shearing forces that can occur between different block and head materials.

The strength of these MLS gaskets comes from their layered stainless steel construction, which also allows them to rebound and resist corrosion. The Viton coating on the outer layers is a heat-resistant material capable of handling temperatures up to 482 degrees Fahrenheit, designed to perform in demanding sealing environments and on various surface finishes. The center layer is uncoated stainless steel, and its thickness can be varied to meet different sealing requirements. This gasket fits a wide range of vehicles, including models like the Dodge D150, Chrysler Cordoba, and Dodge Charger from various years.