What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic MLS head gasket is .051 inches. This measurement is important for ensuring proper compression ratios and valve-to-piston clearance.

Do I need to use any sealant with this gasket?

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

What is the advantage of Multi-Layer Steel (MLS) construction?

MLS construction uses multiple layers of stainless steel, which increases the gasket's strength and ability to rebound, helping it resist corrosion and withstand the shearing forces between different block and head materials.

Specifications

Brand: Cometic Gasket
Part #: C5409-051
UPC: 191070126148

Cometic AMC 390/401 Gen-3 V8 .051in MLS Cyl Head Gasket-4.380in Bore-With Indy Heads-18 Bolt Head

Name: Cometic AMC 390/401 Gen-3 V8 .051in MLS Cyl Head Gasket-4.380in Bore-With Indy Heads-18 Bolt Head
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-amc-390-401-gen-3-v8-051in-mls-cyl-head-gasket-4-380in-bo-t14-803910
Price: 111.49 USD
Availability: BackOrder

$111.49

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Cometic MLS head gasket for AMC 390/401 Gen-3 V8 engines with Indy heads. .051in thickness, 4.380in bore.

Key Features

Fits AMC 390/401 Gen-3 V8 engines with Indy heads.
Multi-Layer Steel (MLS) construction offers increased strength and rebound resistance.
Embossed outer layers are coated with Viton for heat resistance up to 482°F (250°C).
Designed for high-output engines and compatible with aluminum heads on aluminum or cast iron blocks.
Features an 18-bolt head pattern and a 4.380-inch bore.
Compressed operating thickness is .051 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

If you're working on an AMC 390 or 401 Gen-3 V8 engine, especially one fitted with Indy heads, this Cometic Multi-Layer Steel (MLS) cylinder head gasket is what you'll need. It's designed with an 18-bolt pattern and a 4.380-inch bore, with a compressed thickness of .051 inches. This gasket is built for high-output engines and is ideal for mating aluminum heads to either aluminum or cast iron blocks, handling the stresses that can arise between dissimilar metals.

Cometic's MLS gaskets are constructed from multiple layers of stainless steel. The outer layers are embossed and coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F (250°C). This coating helps ensure a strong seal in demanding conditions and resists corrosion. The center layer is uncoated stainless steel and can be varied to achieve different thicknesses, like the .051 inches on this particular gasket. These gaskets are designed to provide maximum sealing performance without needing additional sealants.