Cometic C4311-051 MLS Head Gasket .051in for 2002-2007 Honda/Acura K20/K24 2.0

Vehicle Fitment

• 2002-2007 Acura RSX (Base, Type-S), Honda Civic Si, Accord (DX/LX/EX/SE/EX-L), CR-V, Element - K20A1, K20A2, K20A3, K24A1, DOHC 2.0/2.4L

Fitment Notes

• Does **not** fit modern K20C turbo or newer K-series engines beyond 2007 unless using the same block/head configuration.
• Not compatible with performance trims or special editions using different bore (not 87mm) without verifying engine code.
• Does not fit 2008+ models that transitioned away from these K20A/K24A configurations - 2025 fitment is unconfirmed.

Features

• MLS (Multi-Layer Steel) construction for durability and better sealing under heat and pressure
• Outer stainless steel layers with embossed sealing beads to maintain clamp load and resist distortion
• Viton rubber coating on both sides of outer layers for high temperature & chemical resistance (≈ 250 °C / 482 °F)
• No sealants required; designed for head/block surfaces with machinable finish
• Ideal for aluminum head to aluminum or aluminum to cast iron block applications
• Designed to resist corrosion and maintain seal under engine flex or thermal cycling
• Bore size matched to 87.00 mm for proper cylinder alignment
• Thickness of .051 in to help adjust compression or compensate for deck or shave tolerances under rebuilds

Specifications

• Bore Diameter: 87.00 mm
• Compressed Operating Thickness: .051 in (≈ 1.295 mm)
• Engine Compatibility: K20A1, K20A2, K20A3, K24A1; 2.0L / 2.4L DOHC inline-4
• Position: cylinder head gasket, entire head-to-block surface
• Material: Multi-layer stainless steel (MLS), with Viton coating
• Requires standard head bolt torque specs; no retorquing needed per Cometic's guidelines
• OEM Part References: 12251-PRB-A01, 12251-PPA-004, 12251-PNC-003
• Fitment confirmed through 2007; 2008-2025 unconfirmed for models not listed

Included Components

• 1x Cometic MLS Head Gasket C4311-051

Product Description

The Cometic C4311-051 is a high-performance MLS (Multi-Layer Steel) head gasket engineered for the Honda/Acura K20/K24 DOHC engine family (2.0L and 2.4L). Featuring three layers of stainless steel and high-temperature Viton coating on both outer surfaces, it provides excellent sealing strength, resistance to distortion, and durable performance under demanding conditions. With a bore size precisely matched to 87.00 mm and compressed operating thickness of .051 inches, this gasket is ideal for engine builds needing refined tolerances - whether due to shaving the deck, compensating for wear, or pushing power capabilities while maintaining reliability.

Fitment is confirmed for 2002-2007 models using K20A1, K20A2, K20A3 and K24A1 engines including RSX, Civic Si, Accord (DX, LX, EX, SE, EX-L), CR-V, and Element trims that use those engines. If your vehicle uses a different engine code (for example K20C turbo, newer K-series, or heavily modified setups), compatibility may not be guaranteed. Installation requires proper torque sequence and clean, flat head and block mating surfaces. No sealant is needed. For 2025 models, fitment is unconfirmed.