What is the advantage of Multi-Layer Steel (MLS) head gaskets?

MLS head gaskets are made from multiple layers of stainless steel, which gives them increased strength and resistance to corrosion. They are also designed to rebound, helping to maintain a strong seal under demanding conditions without needing extra sealants.

What does the Viton coating on the outer layers do?

The Viton coating is a heat-resistant rubber material that can withstand temperatures up to 482°F (250°C). It's applied to the outer layers of the gasket to ensure a reliable seal in harsh environments and across different surface finishes.

Why do some aftermarket head gaskets have undersized water ports?

Undersized water ports on aftermarket head gaskets, like this Cometic model, are intentionally designed to allow for custom port matching. This gives mechanics the flexibility to precisely align the gasket's water passages with the ports on aftermarket cylinder heads for optimal coolant flow.

Specifications

Brand: Cometic Gasket
Part #: C5432-056
UPC: 191070126322

Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .056in MLS Cylinder Head Gasket - 4.310in Bore

Name: Cometic Chevrolet Mark-IV - GM Gen-V/VI Big Block V8 .056in MLS Cylinder Head Gasket - 4.310in Bore
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-chevrolet-mark-iv-gm-gen-v-vi-big-block-v8-056in-mls-cyli-t14-803724
Price: 141.79 USD
Availability: BackOrder

$141.79

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Cometic Chevrolet Mark-IV, GM Gen-V/VI Big Block V8 .056in MLS head gasket. 4.310in bore, Viton coated.

Key Features

Fits 1965-1975 Chevrolet Bel Air, 1965-1972 Chevrolet Biscayne, 1973-1974 Chevrolet Blazer, and many other Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 vehicles.
Multi-Layer Steel (MLS) construction offers increased strength and resistance to corrosion.
Outer layers are embossed and coated with Viton, a heat-resistant rubber material rated up to 482°F (250°C).
Compressed operating thickness is 0.036 inches, with an overall gasket thickness of 0.056 inches.
Features a 4.310-inch bore diameter.
Designed for aftermarket heads with undersized water ports to allow for customization.

⚠️ 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

Starting with a compressed thickness of 0.036 inches, this Cometic Multi-Layer Steel (MLS) head gasket is built for serious sealing. It's designed for Chevrolet Mark-IV and GM Gen-V/VI Big Block V8 engines, featuring a 4.310-inch bore. This gasket is ideal for high-output applications where a reliable seal is critical, and it doesn't require any additional sealants.

The construction uses multiple layers of stainless steel for strength and corrosion resistance. 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 makes it suitable for sealing between aluminum heads and either aluminum or cast iron blocks, as it can manage the stresses that arise from different metals. The center layer is uncoated stainless steel, allowing for variations in thickness to meet specific needs. This particular gasket is noted for having undersized water ports, which is a common feature when using aftermarket heads, giving you room for custom port matching.

This gasket fits a wide range of vehicles, including popular models like the 1965-1975 Chevrolet Impala, 1968-1974 Chevrolet C10 Pickup, and 1965-1974 Chevrolet Corvette. It's a well-built component for rebuilding or upgrading your Big Block V8.