What is the compressed thickness of this head gasket?

The compressed operating thickness for this Cometic head gasket is .120 inches. This measurement is important for ensuring proper valve-to-piston clearance and compression ratios after installation.

Do I need to use any sealant with this gasket?

No, this Cometic MLS head gasket is designed to be installed without any additional sealants. The Viton coating on the outer layers provides the necessary sealing capabilities.

What is the benefit of Multi-Layer Steel (MLS) construction?

MLS construction uses multiple layers of stainless steel, which significantly increases the gasket's strength and its ability to resist corrosion. This design also allows the gasket to rebound and maintain a seal under demanding conditions.

Specifications

Brand: Cometic Gasket
Part #: C5740-120
UPC: 191070138370

Cometic Chevrolet 4.3L Gen-1 90 Degree V6 .120in MLS Cylinder Head Gasket - 4.120in Bore

Name: Cometic Chevrolet 4.3L Gen-1 90 Degree V6 .120in MLS Cylinder Head Gasket - 4.120in Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevrolet-4-3l-gen-1-90-degree-v6-120in-mls-cylinder-head-t14-805305
Price: 238.84 USD
Availability: BackOrder

$238.84

On Backorder

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

Cometic Chevrolet 4.3L Gen-1 head gasket. MLS construction with Viton coating for reliable sealing.

Key Features

Fits a wide range of Chevrolet and GMC vehicles, including models like the Chevrolet Astro and GMC C1500.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are embossed and coated with Viton, a heat-resistant elastomer rated up to 482°F (250°C).
Designed for a 4.120-inch bore size.
Compressed operating thickness is .120 inches.
Suitable for both aluminum heads to aluminum blocks and aluminum heads to 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

If you're rebuilding the top end of your Chevrolet 4.3L Gen-1 V6, a solid cylinder head gasket is crucial for sealing combustion pressure and coolant passages. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the demands of these engines, ensuring a reliable seal between your cylinder head and block.

This gasket is constructed from 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 temperatures up to 482°F (250°C). This combination allows the gasket to withstand the shearing forces between aluminum and cast iron blocks, making it suitable for a wide range of applications. The compressed operating thickness is .120 inches, and it's designed for a 4.120-inch bore, fitting many Chevrolet and GMC trucks and vans from the mid-80s to the mid-90s, like the Chevrolet Astro or GMC C1500.

Because it's an MLS gasket with Viton coating, it doesn't require any additional sealants, simplifying installation. This makes it a strong option for both aluminum-to-aluminum and aluminum-to-cast iron head and block combinations.