Cometic MLS Head Gasket – Toyota 4A-GE | 83mm Bore | 0.056"

Achieve maximum head sealing performance on your Toyota 4A-GE build with the Cometic MLS (Multi-Layer Steel) Head Gasket. Engineered for today's high-output engines, Cometic MLS head gaskets provide superior sealing performance over OEM-style composite gaskets — requiring no sealants and delivering long-term reliability on both aluminum-to-aluminum and aluminum-to-cast-iron head and block combinations. This 83mm bore, 0.056" nominal thickness gasket is suited for standard bore 4A-GE builds and mild overbore applications.

Key Features

• Multi-Layer Steel (MLS) Construction: Comprised of multiple embossed layers of stainless steel for increased strength, superior sealing performance, and the ability to rebound and resist corrosion — outperforms OEM-style composite head gaskets in high-output applications
• Viton-Coated Outer Layers: Outer stainless steel layers are embossed and coated on both sides with Viton — a fluoroelastomer rubber material heat resistant to 250°C / 482°F — designed to meet the demands of harsh sealing environments, varied load conditions, and a range of surface finishes
• Uncoated Stainless Shim Center Layer: Center shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements for compression ratio tuning
• No Sealant Required: Cometic MLS gaskets provide maximum sealing performance without the need for additional sealants — clean, straightforward installation
• Aluminum & Cast Iron Compatible: Suitable for aluminum heads to aluminum blocks and aluminum heads to cast iron blocks — withstands the shearing force created by dissimilar material thermal expansion
• Cometic Quality: Manufactured by Cometic Gasket — a globally recognized leader in performance and OEM-replacement gasket solutions trusted by professional engine builders worldwide

Specifications

• Type: MLS Head Gasket
• Engine: Toyota 4A-GE 1.6L DOHC
• Bore: 83mm
• Nominal Thickness: 0.056"
• Compressed Operating Thickness: 0.036"
• Material: Multi-Layer Stainless Steel / Viton-Coated Outer Layers
• Sealant Required: No
• Fitment: Toyota 4A-GE — AE86 Corolla/Sprinter, AW11 MR2, and related platforms
• Part Number: C4166-056

Note: Verify bore size, deck height, and target compression ratio before ordering. Surface finish of the head and block deck must meet Cometic's recommended specifications for MLS gaskets — a minimum 60 Ra surface finish is typically required. Professional engine building by an experienced machinist is recommended. Pair with the Cometic Street Pro Bottom End Kit (PRO2041B) for a complete 4A-GE gasket solution.