What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic head gasket is .120 inches. This measurement is crucial for ensuring proper compression ratios and valve-to-piston clearance in your engine build.

Can I use this gasket with aftermarket cylinder heads?

Yes, this gasket is specifically designed for aftermarket heads. It features undersized water ports that allow for customization to match your specific head and block configuration.

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

Viton is a heat-resistant synthetic rubber material that can withstand high temperatures, up to 482°F. It's used on the outer layers of this gasket to provide a robust seal in demanding engine environments and is compatible with various surface finishes.

Specifications

Brand: Cometic Gasket
Part #: C5403-120
UPC: 191070125950

Cometic Chevrolet Gen-1 Small Block V8 .120in MLS Cylinder Head Gasket - 4.200in Bore

Name: Cometic Chevrolet Gen-1 Small Block V8 .120in MLS Cylinder Head Gasket - 4.200in Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevrolet-gen-1-small-block-v8-120in-mls-cylinder-head-ga-t14-805615
Price: 249.06 USD
Availability: BackOrder

$249.06

On Backorder

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Cometic Gasket is known for well-built engine components. This .120in MLS head gasket fits many Chevrolet Gen-1 Small Block V8 engines.

Key Features

Fits 1980-1986 Chevrolet C10, 1980-1986 Chevrolet Camaro, and many other Chevrolet Gen-1 Small Block V8 vehicles.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are coated with heat-resistant Viton rubber, rated up to 482°F.
Compressed operating thickness is .120 inches with a 4.200 inch bore.
Designed for high-output engines and requires no additional sealants.
Suitable for sealing aluminum heads to aluminum 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

Cometic Gasket has a solid reputation for making well-built engine components, and this Multi-Layer Steel (MLS) head gasket is a prime example. It’s designed for Chevrolet Gen-1 Small Block V8 engines and features a 4.200-inch bore with a compressed thickness of .120 inches. This gasket is built to handle the demands of high-output engines, making it a strong choice for rebuilds or performance upgrades on a wide range of vehicles, including models like the Chevrolet C10, Camaro, and GMC C1500 from the 1980s.

What sets this gasket apart is its construction. It's made from multiple layers of stainless steel, which gives it increased strength and resistance to corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F and works well with different surface finishes. This design means you don't need extra sealants, and it can effectively seal between aluminum heads and either aluminum or cast iron blocks, resisting the shearing forces that can occur between dissimilar metals. The center layer is uncoated stainless steel, allowing for precise thickness control, and the water ports are undersized to give you flexibility for custom applications, especially when using aftermarket heads.