What is the compressed thickness of this head gasket?

The compressed operating thickness of this Cometic head gasket is .040 inches. This measurement is important for ensuring proper piston-to-valve clearance and compression ratio after installation.

Do I need to use any 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 tight seal against the cylinder head and block surfaces.

What does 'MLS' stand for and why is it important?

MLS stands for Multi-Layer Steel. This construction uses multiple layers of stainless steel, which makes the gasket stronger, more durable, and resistant to corrosion compared to single-layer gaskets. It's ideal for high-output engines.

Specifications

Brand: Cometic Gasket
Part #: C5249-040
UPC: 191070004606

Cometic Chevrolet Gen-1 Small Block V8 4.200in Bore .040in MLS Cylinder Head Gasket w/ Steam Holes

Name: Cometic Chevrolet Gen-1 Small Block V8 4.200in Bore .040in MLS Cylinder Head Gasket w/ Steam Holes
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevrolet-gen-1-small-block-v8-4-200in-bore-040in-mls-cyl-t14-279128
Price: 97.74 USD
Availability: InStock

$97.74

Only 1 left in stock

Cometic Chevrolet Gen-1 Small Block V8 head gasket with a 4.200in bore and .040in thickness. Features MLS construction with Viton coating.

Key Features

Fits a wide range of Chevrolet and GMC Gen-1 Small Block V8 vehicles from 1980-1986.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are coated with heat-resistant Viton rubber for reliable sealing.
Compressed operating thickness is .040 inches.
Features a 4.200 inch bore size.
Includes steam holes for improved 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

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About this part

Product Details

If you're rebuilding the top end of your Chevrolet Gen-1 Small Block V8, this Cometic Multi-Layer Steel (MLS) cylinder head gasket is a solid choice. It's built to handle the demands of higher output engines and fits a wide range of vehicles from the early 80s, including popular models like the Chevrolet C10, Camaro, and GMC C1500.

This gasket is constructed from multiple layers of stainless steel, which gives it 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 coating helps ensure a reliable seal even with different head and block materials, like aluminum heads on cast iron blocks, and it means you won't need any extra sealants during installation. The compressed operating thickness is .040 inches, and it includes steam holes to help manage heat.