Cometic C4312-045 MLS Head Gasket .045in 88mm for 2002-2007 Honda/Acura K20/K24

Vehicle Fitment

• 2002-2007 Acura RSX (Base, Type-S), 2002-2005 Honda Civic Si, 2003-2007 Honda Accord (DX, LX, EX, SE, Value, EX-L), 2002-2014 Honda CR-V (LX, EX, SE, EX-L), 2003-2011 Honda Element (DX, EX, LX, SC) - all with K20A1, K20A2, K20A3, K20Z1, K24A1, K24A4, K24A8, K24Z series DOHC 2.0L / 2.4L engines

Fitment Notes

• Does **not** fit newer K20C (turbo) or later K-series engines with different block/head geometry unless exact match to OEM K20/K24 as listed
• Requires properly machined, flat head and block mating surfaces with correct surface finish per Cometic MLS guidelines
• 2025 fitment unconfirmed; confirmed through 2014 (for some models) and through 2007 for most listed models

Features

• Multi-Layer Steel (MLS) construction for superior sealing under heat, pressure, and high output conditions :contentReference[oaicite:0]{index=0}
• Outer layers embossed and coated with Viton on both sides for chemical and temperature resistance (≈ 250 °C / 482 °F) :contentReference[oaicite:1]{index=1}
• Three stainless steel layers with a central uncoated shim layer for controlled thickness and strength :contentReference[oaicite:2]{index=2}
• Bore size of 88.00 mm to match OEM K20/K24 specification :contentReference[oaicite:3]{index=3}
• Compressed thickness: .045 in (≈ 1.143 mm), giving a balance between sealing and deck clearance :contentReference[oaicite:4]{index=4}
• No sealants required; designed to seal dry when surfaces are properly prepared :contentReference[oaicite:5]{index=5}
• Suitable for aluminum head to aluminum block and aluminum head to cast iron block applications (handles material shearing) :contentReference[oaicite:6]{index=6}
• OEM cross-references included: 12251-PRB-A01, 12251-PPA-004, 12251-PNC-003 :contentReference[oaicite:7]{index=7}

Specifications

• Bore Diameter: 88.00 mm :contentReference[oaicite:8]{index=8}
• Compressed Operating Thickness: .045 in (≈ 1.143 mm) :contentReference[oaicite:9]{index=9}
• Engine Compatibility: K20A1, K20A2, K20A3, K20Z1; K24A1, K24A4, K24A8, K24Z series - all DOHC 2.0L / 2.4L inline-4 :contentReference[oaicite:10]{index=10}
• Position: Cylinder Head Gasket (head-to-block sealing surface) - full gasket around all four cylinders :contentReference[oaicite:11]{index=11}
• Material: Multi-layer stainless steel with Viton-coated outer layers, center uncoated shim layer :contentReference[oaicite:12]{index=12}
• Number of layers: 3 :contentReference[oaicite:13]{index=13}
• Surface finish / head block flatness requirement: OEM or better, clean mating surfaces per Cometic spec :contentReference[oaicite:14]{index=14}
• Fitment confirmed through model years up to 2014 (CR-V), 2007 for most Accord, RSX, Civic listed; 2025 unconfirmed :contentReference[oaicite:15]{index=15}

Included Components

• 1x Cometic MLS Head Gasket C4312-045

Product Description

The Cometic C4312-045 is a performance-grade Multi-Layer Steel (MLS) head gasket engineered for Honda/Acura's K20/K24 DOHC engine families, specifically for 2.0L / 2.4L inline-4 setups. It features an 88.00 mm bore and a compressed thickness of .045 inches (≈ 1.143 mm), ideal for applications where slight deck clearance adjustments are needed without sacrificing sealing integrity. The gasket construction includes three stainless steel layers, with embossed and Viton-coated outer layers to resist heat, oil, and chemical exposure, and a central uncoated shim steel layer to maintain rigidity under high compression or mild forced induction use.

Fitment is confirmed for 2002-2007 models using K20A1, K20A2, K20A3, K20Z1, and K24A engines. Applicable vehicles include Acura RSX (Base and Type-S), Honda Civic Si, Accord (DX, LX, EX, SE, EX-L, Value, Special Edition), CR-V, and Element. Because material, block geometry, and component specifications must match, this part does **not** fit newer K20C turbo or later K-series variants unless confirmed by the user. Installation requires clean, flat head and block surfaces and correct torque procedures. Fitment confirmed through 2014 for some CR-V/Element trims; 2025 unconfirmed.