What makes Cometic MLS head gaskets good for high-output engines?

Cometic MLS head gaskets use multiple layers of stainless steel for superior strength and rebound. The outer layers are coated with Viton, a heat-resistant elastomer, which helps create a robust seal capable of withstanding the higher pressures and temperatures found in high-output engines.

Do I need to use sealant with this head gasket?

No, Cometic MLS head gaskets are designed to provide maximum sealing performance and do not require additional sealants. Their multi-layer construction and Viton coating create an effective seal on their own.

What does 'undersized water ports' mean for installation?

The undersized water ports on this gasket are intended for engines using aftermarket cylinder heads. This feature allows for customization to precisely match the water passages between the head and the block, ensuring a proper seal and coolant flow for your specific setup.

Specifications

Brand: Cometic Gasket
Part #: C5434-045
UPC: 191070034290

Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .045in MLS Cylinder Head Gasket - 4.630in Bore

Name: Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .045in MLS Cylinder Head Gasket - 4.630in Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevrolet-mark-iv-gm-gen-v-vi-big-block-v8-045in-mls-cyli-t14-803743
Price: 105.02 USD
Availability: BackOrder

$105.02

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Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .045in MLS Cylinder Head Gasket - 4.630in Bore. Built for high output engines.

Key Features

Fits a wide range of Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines.
Multi-Layer Steel (MLS) construction offers increased strength and corrosion resistance.
Outer layers are coated with heat-resistant Viton rubber for effective sealing.
Compressed operating thickness is 0.045 inches.
Bore size is 4.630 inches.
Suitable for 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 working on a Chevrolet Mark-IV or GM Gen-V/VI Big Block V8 engine, this Cometic Multi-Layer Steel (MLS) head gasket is a solid choice for sealing your combustion chambers. It's designed with a compressed thickness of .045 inches and a bore size of 4.630 inches, making it suitable for a wide range of applications, including those using aftermarket heads like Brodix Big Duke or Brodie Heads. These gaskets are built to handle the demands of high-output engines.

Cometic's MLS design 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. This construction means the gasket seals effectively without needing additional sealants, and it's well-suited for combinations of aluminum heads with either aluminum or cast iron blocks, as it can manage the stresses between different metals.

The center layer of stainless steel can be varied to achieve different thicknesses, and in this specific gasket, the water ports are undersized to allow for customization when used with aftermarket heads. This attention to detail helps ensure a proper seal and performance for your build.