Cometic 86mm MLS .030in Head Gasket Honda Civic Si 2006-2011 | C4561-030

The Cometic C4561-030 MLS Head Gasket is engineered for 2006–2011 Honda Civic Si K20Z3 engines, delivering superior sealing performance for high-compression, turbocharged, supercharged, and performance street or race applications. Built using advanced Multi-Layer Steel (MLS) technology, this gasket is designed to withstand the increased cylinder pressures and temperatures associated with high-performance engine builds.

Constructed with multiple embossed layers of stainless steel and coated with a heat-resistant Viton rubber material, the Cometic MLS gasket provides exceptional sealing reliability while resisting corrosion and maintaining long-term durability.

Key Features & Benefits

• MLS (Multi-Layer Steel) construction for superior sealing performance
• Designed for high-performance and boosted applications
• 86mm bore size optimized for K20Z3 engines
• .030-inch compressed thickness
• Stainless steel layers improve strength and rebound characteristics
• Viton-coated outer layers resist heat and harsh operating conditions
• Excellent sealing for aluminum heads and blocks
• No additional sealants required when installed properly

Specifications

• Part Number: C4561-030
• Engine Compatibility: Honda K20Z3
• Bore Size: 86mm
• Compressed Thickness: .030”
• Material: MLS Stainless Steel
• Layers: 3-layer design

Performance Advantages

• Handles increased cylinder pressure from forced induction and high compression builds
• Improved durability over conventional composite gaskets
• Excellent resistance to combustion leakage and fluid seepage
• Designed for consistent sealing under extreme heat cycles

Enthusiasts in engine building communities often recommend MLS gaskets like Cometic for boosted and high-performance applications, while emphasizing the importance of proper deck surface finish and installation procedures for optimal sealing.

Installation Notes

• Proper head and block surface finish is critical for MLS gasket sealing
• Professional installation strongly recommended
• Verify head and block flatness before installation
• Follow OEM or upgraded head stud torque specifications
• Ideal for use with upgraded head studs in performance builds

Why Choose Cometic MLS Gaskets?

Cometic is trusted throughout motorsports for producing high-quality sealing solutions capable of handling extreme cylinder pressures and demanding racing conditions. The C4561-030 is an excellent choice for K20 enthusiasts building reliable high-performance street or track engines.