What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic head gasket is 0.030 inches. This measurement is critical for maintaining proper compression ratios after installation.

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

Viton is a heat-resistant rubber material that can withstand high temperatures, up to 482 degrees Fahrenheit. It's used on the outer layers of this gasket to ensure a reliable seal in demanding engine conditions and across various surface finishes.

Does this head gasket require any additional sealants?

No, Cometic MLS head gaskets are designed to provide maximum sealing performance without the need for additional sealants. They are engineered to seal effectively on their own.

Specifications

Brand: Cometic Gasket
Part #: C4561-030
UPC: 191070047535

Cometic 06-09 Honda Civic Si 86mm MLS .030in Head Gasket

Name: Cometic 06-09 Honda Civic Si 86mm MLS .030in Head Gasket
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-06-09-honda-civic-si-86mm-mls-030in-head-gasket-t14-19534
Price: 102.84 USD
Availability: BackOrder

$102.84

On Backorder — Expected to ship by May 21, 2026

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

Fits 2006-2011 Honda Civic Si. This Cometic MLS head gasket has a 0.030in compressed thickness and Viton coating for reliable sealing.

Key Features

Fits 2006-2011 Honda Civic Si.
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.
Compressed operating thickness is 0.030 inches.
Features an 86mm bore size.
Designed for the Honda K20Z3 engine.

⚠️ 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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Will it fit your car?

Fits these vehicles

Honda Civic 2006-2011

About this part

Product Details

This Cometic Multi-Layer Steel (MLS) head gasket is built for the 2006-2011 Honda Civic Si, specifically for the K20Z3 engine. It features a compressed operating thickness of 0.030 inches and an 86mm bore, designed to provide a solid seal for high-output engines.

The gasket is constructed from multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are coated with Viton, a heat-resistant rubber material capable of withstanding temperatures up to 482 degrees Fahrenheit. This coating ensures effective sealing even in demanding conditions and across different surface finishes, making it suitable for both aluminum-to-aluminum and aluminum-to-cast iron block configurations. The center layer is uncoated stainless steel, allowing for precise thickness control.