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Cometic GM/Mercury Marine 1050 Gen-IV Big Block V8 .080in MLS Cylinder Head Gasket-4.530in Bore

SKU: CGSC5639-080

Head Gaskets

CG Head Gaskets...

Cometic GM/Mercury Marine 1050 Gen-IV Big Block V8 .080in MLS Cylinder Head Gasket-4.530in Bore

SKU: CGSC5639-080

Head Gaskets

CG Head Gaskets...

A$404.64
Special Order. Contact for ETA. This item is out of stock in our warehouse and partner distribution centres. In some cases, this may be due to not having live inventory feeds available for all suppliers. Please contact us before ordering if you need to meet a specific deadline.

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Description

Cylinder Head Gasket

MLS Gaskets are comprised of multiple embossed layers of both AMP (Advanced Multi-Polymer Coating) and uncoated stainless steel

Additional Information

GM/Mercury Marine 1050 Gen-IV Big Block V8 .080" MLS Cylinder Head Gasket, W/2 Slotted Lifter Valley Bolts, 4.530" Bore

Part Type

Engine Cylinder Head Gasket

Product Overview

Comprised of multiple embossed layers of stainless steel with the outer layers utilizing a Viton rubber coating. Compressed operating thickness is 0.098". Cometic MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for todays high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flour elastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements.

Data: v4.2 - Upd: 2026-11-07 21:33:50

Features

  • Coated On Both Sides w/Viton
  • Conforms load distribution across the sealing area
  • Requires less clamp load creating less bore distortion
  • The center or shim layer is an uncoated stainless steel layer which can be varied to accommodate multiple thickness requirements
  • The embossed outer layers of the gaskets meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes

Images are supplied by the manufacturer and may be generic. While all efforts are made to provide accurate pictures, there may be differences in the actual product, such as colour, quantity, version, or included components. Please carefully review the description and specifications for details on inclusions or any variations. Some items may be sold individually or in sets, and images may occasionally depict additional products or quantities not included in your purchase. For assistance or clarification, please contact customer support.

Specifications

Product Details

Description:GM/Mercury Marine Gen-IV Cylinder Head Gasket
Engine Make/Size:GM/Mercury Marine Gen IV Big Block
Part Number:cgsC5639-080
Title:Cometic Gasket Automotive GM/Mercury Marine 1050 Gen-IV Big Block V8 .080 in MLS Cylinder Head Gasket, W/2 Slotted Lifter Valley Bolts, 4.530 in Bore

Product Downloads

# Document Type Download
1. Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Data: v2 - Desc: v4.2 - Upd: 2026-11-07 18:51:07

Reference Information

Reference Data (Provide these details to our support team)
Brand Name/s Cometic Gasket, Cometic, Cometic Gasket Automotive, Cometic Gasket Marine, Cometic Gasket Powersports, COMETIC GASKETS, Cometic Powersport Gaskets
StreetFX SKU cgsC5639-080
SFX Item ID 4169736
Accounting SKU cgs-C5639-080
Manufacturer SKU C5639-080
Manufacturer UPC 191070136109
Alternative References C5639-080, CGT-C5639-080

.080" MLS-5 W/2 BOLT INTAKE

Cometic MLS marine head gaskets are designed to provide maximum sealing performance for today's high-output marine engines. These high performance gaskets feature multi-layer stainless steel construction that provides excellent strength, rebound, and corrosion resistance. Their outer layers are embossed and coated on both sides with Viton®, which meets the demands of harsh sealing environments, load conditions, and surface finishes. The center layer is uncoated stainless steel, which is available in multiple thicknesses. Cometic MLS marine head gaskets promote an even clamp load across the sealing surface for reduced bore distortion, with no need to retorque.

Product Attributes
BrandCometic
Manufacturer's Part NumberC5639-080
Part TypeHead Gaskets
Product LineCometic MLS Marine Head Gaskets
UPC00191070136109
Bore (in.)4.530 in.
Bore (mm)115.060mm
Gasket MaterialMulti-layer stainless steel
Compressed Thickness (in.)0.080 in.
Compressed Volume (cc)21.129cc
Lock WireNo
QuantitySold individually.
NotesDesigned to fit Mercury marine 1050 Gen IV with 2-bolt intake side of gasket applications.

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