Cometic Gasket MLS Head Gasket

2003+ Subaru EJ255/EJ257 Engines

Part #: C4574-066

Overview

The Cometic MLS Head Gasket is a high-performance sealing solution designed specifically for Subaru EJ255 and EJ257 engines from 2003 onward. Crafted with precision and engineered for durability, this multi-layer steel gasket provides a reliable seal under demanding conditions. Whether you're building a performance engine, restoring a stock setup, or upgrading for enhanced reliability, this gasket ensures optimal sealing and long-lasting performance.

Ideal for enthusiasts and professional rebuilders alike, the MLS head gasket helps support increased horsepower and torque by maintaining a superior seal between the cylinder head and engine block. Its robust construction minimizes the risk of head gasket failure, especially in high-boost or high-compression applications, making it a trusted choice for street, spirited driving, and performance tuning.

Key Features

Designed with advanced materials and manufacturing techniques, the Cometic MLS Head Gasket offers several key benefits:

• Multi-Layer Steel Construction: Composed of three layers of embossed stainless steel, providing excellent strength, flexibility, and rebound characteristics for a reliable seal.
• Viton Coated Outer Layers: The outer layers are coated with Viton, a high-performance rubber compound that enhances resistance to heat, chemicals, and corrosion, ensuring durability over time.
• Precise Bore Size and Thickness: Featuring a bore size of 101mm, this gasket is engineered to match OEM specifications and custom applications, with varying thickness options to optimize compression and clearance.
• Corrosion Resistance: The stainless steel layers and Viton coating work together to resist corrosion, ensuring consistent performance even in harsh environments.
• Rebound and Seal Integrity: The embossed design and multi-layer construction provide excellent rebound characteristics, helping to maintain a tight seal during thermal expansion and engine operation.
• Sold Individually: Each gasket is sold separately, allowing for precise replacement during engine rebuilds or upgrades.

Construction & Design

The Cometic MLS Head Gasket is meticulously manufactured using state-of-the-art CNC machining and embossing techniques. Its three-layer design ensures a perfect balance of strength and flexibility, accommodating the thermal cycling and mechanical stresses typical in high-performance engines. The embossed outer layers are coated with Viton, a synthetic rubber that enhances sealing capabilities and chemical resistance. This combination results in a gasket that not only seals effectively but also resists corrosion and degradation over time.

The gasket's bore size of 101mm is carefully engineered to match OEM specifications for Subaru EJ255 and EJ257 engines, ensuring a precise fit. The varying thickness options allow tuners and builders to fine-tune compression ratios and clearance, making this gasket versatile for different build goals. Its robust construction and high-quality materials make it suitable for both daily driving and high-performance applications.

Performance & Reliability

The MLS Head Gasket by Cometic is designed to provide a superior seal compared to traditional composite gaskets. Its multi-layer steel construction offers excellent durability and resilience, helping to prevent head gasket leaks even under increased boost or compression. This gasket is ideal for engines that see spirited driving, tuning, or modifications that elevate power output. Its reliable sealing helps maintain consistent compression and combustion efficiency, contributing to improved engine performance and longevity.

Installation & Fitment

The Cometic MLS Head Gasket is a direct replacement for the factory gasket on 2003+ Subaru EJ255 and EJ257 engines. Installation is straightforward for experienced mechanics and rebuilders familiar with Subaru engine assembly. No special modifications are required, and the gasket is designed to fit OEM head bolts and engine components seamlessly. Proper torque specifications and installation procedures should be followed to ensure optimal sealing and performance.

• Ensure the mating surfaces are clean and free of debris before installation.
• Use the recommended torque sequence and specifications provided by Subaru or your engine builder.
• Check for proper alignment and sealing after installation.

No cutting, drilling, or tuning modifications are necessary when installing this gasket, making it a reliable choice for a straightforward rebuild or upgrade.

What's Included

• One MLS Head Gasket with 101mm bore
• Viton coated outer layers for enhanced sealing and corrosion resistance

Ideal For

• Engine rebuilds and restorations for Subaru EJ255/EJ257 engines
• Performance upgrades requiring a durable, high-quality head gasket
• Street, spirited driving, and moderate racing applications
• Enthusiasts seeking reliable sealing for high-boost or high-compression setups

Emissions Note

This product is designed to meet or exceed OEM specifications for sealing and durability. Please verify local regulations regarding emissions compliance before installation. The Cometic MLS Head Gasket is intended for use in off-road, racing, or non-emissions-compliant applications where permitted by law.