What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic MLS head gasket is .040 inches. This is achieved through the specific design of its multiple stainless steel layers.

Do I need to use sealant with this gasket?

No, Cometic MLS head gaskets are designed to provide maximum sealing performance without the need for additional sealants. The Viton coating on the outer layers ensures a strong seal on its own.

What is the bore size for this gasket?

This specific head gasket is designed for a 4.200 inch bore. It also includes valve pocketed bores and steam holes for optimal engine performance.

Specifications

Brand: Cometic Gasket
Part #: C5273-040
UPC: 191070001216

Cometic Chevy Gen-1 Small Block V8 .040in MLS Cylinder Head Gasket - 4.200in Bore

Name: Cometic Chevy Gen-1 Small Block V8 .040in MLS Cylinder Head Gasket - 4.200in Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevy-gen-1-small-block-v8-040in-mls-cylinder-head-gasket-t14-806181
Price: 97.74 USD
Availability: BackOrder

$97.74

On Backorder

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Cometic Chevy Gen-1 Small Block V8 .040in MLS Head Gasket - 4.200in Bore. Built with multiple stainless steel layers and Viton coating for a strong seal.

Key Features

Fits 56+ vehicle make/model combinations.
Multi-Layer Steel (MLS) construction for increased strength and sealing.
Outer layers are coated with heat-resistant Viton rubber.
Compressed operating thickness is .040 inches.
Designed for a 4.200 inch bore.
Features steam holes for heat management.

⚠️ 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

No-fit, no charge. Wrong part? Send it back, free return label.

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Will it fit your car?

About this part

Product Details

When you're rebuilding the top end of your Chevy Gen-1 Small Block V8, you need a head gasket that can handle the pressure. This Multi-Layer Steel (MLS) gasket from Cometic is built to seal effectively, even in high-output engines. It's designed to work with both aluminum and cast iron blocks, and it doesn't require any additional sealants, making installation more straightforward.

What you get here is a well-built gasket made from multiple layers of stainless steel. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482°F (250°C). This construction not only provides a strong seal but also helps the gasket rebound and resist corrosion. The center layer is stainless steel, and its thickness is varied to meet specific requirements, like the .040 inch compressed thickness on this particular gasket. It also features steam holes to help manage heat.

This gasket is a solid option for a wide range of vehicles, including many Chevrolet C-series trucks, Camaro, Corvette, and GMC trucks from the 1980s. It's designed for a 4.200 inch bore and includes valve pocketed bores and steam holes.