Key Specifications
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Part Number: C4234051
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Engine: 4G63 / 4G63T DOHC 2.0L
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Bore Size: 86mm
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Thickness: 1.3mm
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Type: MLS (Multi-Layer Steel)
⚠️ Always confirm bore size and compression goals before ordering.
Mitsubishi 4G63/4G63T .051″ MLS Cylinder Head Gasket, 86mm Bore, DOHC, Except Evo 4-9
Why MLS Over Composite?
Cometic MLS gaskets offer:
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Superior clamping strength
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High boost durability
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Improved heat resistance
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Better long-term sealing
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Compatibility with ARP head studs
On a turbo 4G63, MLS is the move.
Ideal Applications
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EVO 1–9 builds
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DSM turbo 4G63 setups
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Big turbo upgrades
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Forged piston builds
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E85 or race fuel applications
Especially recommended when paired with upgraded head studs.
From the manufacturer
MATERIALS THAT MATTER
ALLOYS
Selected for their resistance to corrosion, tensile and yielding strength, Cometic alloy materials include Copper, Aluminum and Stainless Steel.
COATED METAL
Chemically blown material compounds feature temperature resistance while maintaining strong torque retention across the surface.
FIBER / METAL LAMINATES
Reinforced gasket material compounds like armor-clad, graphite and galvanized steel constructed for sealing irregular surfaces.
Cometic C4234051 4G63 MLS head gasket Installation Requirements
MLS gaskets demand precision:
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Deck surface must be smooth (RA spec compliant)
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Head and block must be flat
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Use proper torque specs
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Follow correct torque sequence
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Clean surfaces thoroughly
Because MLS gaskets don’t forgive shortcuts.
Why 1.3mm Thickness?
The 1.3mm thickness helps:
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Maintain proper compression ratio
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Fine-tune quench clearance
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Support boost-friendly setups
Always calculate final compression based on piston dish and deck height.
HEAD GASKETS
Multi-Layer Steel gaskets comprised of multiple embossed layers of both proprietary high temperature coated and uncoated stainless steel.
Final Verdict
The Cometic C4234051 MLS Head Gasket (86mm / 1.3mm) is a high-performance sealing solution for turbocharged 4G63 builds. Strong, reliable, and designed for serious cylinder pressure.
Because sealing boost is non-negotiable.
Amazon Customer –
Had a bend in the firing ring product looked like it would have been great though sadley couldnt use it. Shipping issue most likely.