What is the compressed thickness of this head gasket?

This Cometic MLS head gasket has a compressed operating thickness of .066 inches. This measurement is important for ensuring the correct compression ratio and valve-to-piston clearance.

Does this gasket require any special sealants?

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 benefit of the Viton coating on the outer layers?

The Viton rubber coating on the outer layers is heat resistant up to 482 degrees Fahrenheit (250 C). It's designed to meet the demands of harsh sealing environments, load conditions, and various surface finishes, ensuring a durable seal.

Specifications

Brand: Cometic Gasket
Part #: C5271-066
UPC: 191070123512

Cometic Chevy Gen-1 Small Block V8 .066in MLS Cylinder Head Gasket - 4.125in Bore

Name: Cometic Chevy Gen-1 Small Block V8 .066in MLS Cylinder Head Gasket - 4.125in Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevy-gen-1-small-block-v8-066in-mls-cylinder-head-gasket-t14-806167
Price: 131.62 USD
Availability: BackOrder

$131.62

On Backorder

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

Cometic Chevy Gen-1 Small Block V8 .066in MLS Cylinder Head Gasket - 4.125in Bore. Built with multiple stainless steel layers and Viton coating for reliable sealing.

Key Features

Fits a wide range of Chevrolet Gen-1 Small Block V8 engines from 1980-1986, as well as other makes like Buick and GMC.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are embossed and coated with Viton, a heat-resistant rubber material suitable for harsh sealing environments.
Compressed operating thickness is .066 inches with a 4.125-inch bore.
Designed for use with both aluminum and cast iron heads and blocks.
Requires no additional sealants for a reliable seal.

⚠️ 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 your Chevrolet Gen-1 Small Block V8, getting the cylinder head gaskets right is crucial for a solid seal. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the demands of higher output engines, offering a reliable seal without needing extra sealants.

This gasket uses multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle tough sealing environments and various surface finishes. The center layer is stainless steel, and its thickness can be varied to meet different requirements; this particular gasket has a compressed thickness of .066 inches and a 4.125-inch bore, making it suitable for a range of Gen-1 Small Block V8 applications, including many Chevrolet, GMC, Buick, and Avanti models from the early to mid-80s.

It's designed to work well with both aluminum and cast iron blocks and heads, and it can handle the shearing forces that can occur when different metals are used together. This gasket also features valve pocketed bores and steam holes for proper engine function.