What is the compressed thickness of this head gasket?

This Cometic Multi-Layer Steel head gasket has a compressed operating thickness of 0.040 inches. This specific thickness is achieved through the design of the center shim layer and the embossed outer layers.

Do I need to use sealant with this head 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 creates a robust seal on its own.

What is the bore size of this gasket?

This head gasket features a bore size of 4.120 inches. It is specifically designed for engines with this bore diameter, ensuring a proper seal around the cylinder.

Specifications

Brand: Cometic Gasket
Part #: C5740-040
UPC: 191070138356

Cometic Chevy 229/262 V-6 4.3L 4.12in Bore .040 inch MLS Head Gasket

Name: Cometic Chevy 229/262 V-6 4.3L 4.12in Bore .040 inch MLS Head Gasket
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevy-229-262-v-6-4-3l-4-12in-bore-040-inch-mls-head-gask-t14-195839
Price: 111.49 USD
Availability: BackOrder

$111.49

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 4.3L V6 MLS head gasket. .040" thick with 4.12" bore for a solid seal.

Key Features

Fits a wide range of Chevrolet and GMC vehicles with 4.3L V6 engines.
Multi-Layer Steel (MLS) construction offers increased strength and durability.
Embossed outer layers are coated with heat-resistant Viton rubber.
Viton coating can withstand temperatures up to 250 C / 482 F.
Designed for use with both aluminum and cast iron engine blocks.
Requires no additional sealants for installation.

⚠️ 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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Will it fit your car?

About this part

Product Details

If you're rebuilding the top end of your 4.3L Chevy V6, a good head gasket is crucial for sealing the combustion chamber and coolant passages. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the pressures of modern engines. It's designed to work with both aluminum and cast iron blocks, and can handle the stresses that come from different metal expansion rates.

Cometic builds these gaskets with multiple layers of stainless steel for strength and corrosion resistance. The outer layers are coated with Viton, a heat-resistant rubber material that can handle temperatures up to 482 degrees Fahrenheit. This combination ensures a strong seal without needing any extra sealants. The center layer is stainless steel and can be varied in thickness, which is how Cometic achieves the specific 0.040 inch compressed thickness on this gasket, with a 4.120 inch bore diameter, making it a precise fit for your engine build.

This gasket is a solid option for a variety of Chevrolet and GMC vehicles from the mid-80s to the mid-90s, including models like the Astro van, S10 pickup, and C/K series trucks. Always refer to the manufacturer's installation instructions for proper torque sequences and procedures.