What is the compressed thickness of this head gasket?

This Cometic MLS head gasket has a compressed operating thickness of 0.066 inches. This measurement is critical for ensuring proper valve-to-piston clearance and compression ratios in your engine build.

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

No, this Multi-Layer Steel (MLS) head gasket is designed to provide maximum sealing performance without the need for additional sealants. The Viton coating on the outer layers ensures a tight seal on its own.

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

Viton is a high-performance, heat-resistant synthetic rubber material. It's used here to create a robust seal that can withstand the high temperatures and harsh conditions found in performance Big Block Chevrolet engines.

Specifications

Brand: Cometic Gasket
Part #: C5329-066
UPC: 191070016494

Cometic Chevy BB 396/402/427/454 4.375in Bore .066 Inch MLS Head Gasket

Name: Cometic Chevy BB 396/402/427/454 4.375in Bore .066 Inch MLS Head Gasket
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevy-bb-396-402-427-454-4-375in-bore-066-inch-mls-head-g-t14-260777
Price: 152.35 USD
Availability: BackOrder

$152.35

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Cometic Chevy BB 396/402/427/454 4.375in Bore .066 Inch MLS Head Gasket. Ensures a solid seal for high-output Big Block engines.

Key Features

Fits a wide range of Chevrolet vehicles including C10 Suburban, Impala, and Camaro.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Embossed outer layers are coated with Viton, a heat-resistant rubber material.
Viton coating can withstand temperatures up to 482°F (250°C).
Designed for high-output engines and requires no additional sealants.
Suitable for sealing aluminum heads to aluminum blocks or cast iron blocks.

⚠️ 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 rebuilding the top end of a Chevrolet Big Block engine, getting the head gasket seal right is crucial for performance and reliability. This Multi-Layer Steel (MLS) head gasket from Cometic is built to handle the demands of high-output V8s, ensuring a strong seal between your cylinder head and block.

Cometic uses multiple layers of stainless steel for increased strength and resistance to corrosion. 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 construction means the gasket can handle the shearing forces between different metals, like aluminum heads on cast iron blocks, and it doesn't require any additional sealants for installation. The center layer is stainless steel and can be varied to achieve different compressed thicknesses, with this specific gasket set at .066 inches with a 4.375-inch bore diameter, perfect for many Chevy Mark-IV Big Block applications.

This gasket fits a wide range of Chevrolet vehicles from the mid-60s through the early 90s, including popular models like the C10 Suburban, Impala, and Camaro. It's a well-built component designed for engines that work hard.