Cometic C4312-030 MLS Head Gasket .030in 88mm for 2002-2007 Honda/Acura K20/K24

Vehicle Fitment

• 2002-2007 Honda/Acura K20A1, K20A2, K20A3, K20Z1, K24A DOHC 2.0L / 2.4L - including Civic Si, RSX (Base, Type-S), Accord (LX/EX/EX-L), CR-V, Element trims using those engines

Fitment Notes

• Not compatible with receiver-grooved or O-ringed heads unless the block/head configuration exactly matches listed K20/K24 series
• Surface finish should be ≤ 50 RA for proper seal; clean and flat head and block mating surfaces required
• 2025 fitment unconfirmed; fitment confirmed through 2007 for listed models

Features

• Multi-Layer Steel (MLS) construction for superior durability and sealing under high loads
• Outer layers embossed and coated with Viton (fluoroelastomer rubber) on both sides for high temperature & chemical resistance :contentReference[oaicite:0]{index=0}
• Three layer stainless steel design to resist corrosion, distortion, and retain clamp load under thermal cycling :contentReference[oaicite:1]{index=1}
• 88.00 mm bore size matching K20/K24 engine specifications :contentReference[oaicite:2]{index=2}
• Compressed operating thickness: 0.030 in (≈ 0.762 mm) for tighter deck clearances or mild builds :contentReference[oaicite:3]{index=3}
• No sealants needed; gasket designed to seal dry when proper finish achieved :contentReference[oaicite:4]{index=4}
• Resists shearing when mating heads and blocks of different materials (aluminum to iron or aluminum to aluminum) :contentReference[oaicite:5]{index=5}
• Ideal for naturally aspirated or boosted applications where tight compression deck clearances are required :contentReference[oaicite:6]{index=6}

Specifications

• Bore Diameter: 88.00 mm :contentReference[oaicite:7]{index=7}
• Compressed Thickness: 0.030 in (≈ 0.762 mm) :contentReference[oaicite:8]{index=8}
• Engine Types: K20A1, K20A2, K20A3, K20Z1, K24A - 2.0L / 2.4L DOHC inline-4 :contentReference[oaicite:9]{index=9}
• Position: Cylinder Head Gasket, head-to-block sealing surface
• Material: Multi-Layer Steel with Viton coated outer layers; center layer uncoated stainless steel shim :contentReference[oaicite:10]{index=10}
• Layer count: 3 layers of steel :contentReference[oaicite:11]{index=11}
• Required head/block surface finish: ≤ 50 RA (roughness average) for reliable sealing :contentReference[oaicite:12]{index=12}
• Installation: no retorquing required per Cometic instructions :contentReference[oaicite:13]{index=13}

Included Components

• 1x Cometic MLS Head Gasket C4312-030

Product Description

The Cometic C4312-030 is a precision Multi-Layer Steel (MLS) head gasket engineered for Honda/Acura's K20/K24 DOHC 2.0L and 2.4L engine families. With a bore of 88.00 mm and compressed thickness of just 0.030 inches, this gasket is built for performance applications where tight tolerances are critical - such as mild builds, forged internals, or when reducing deck height. The three-layer stainless steel design, combined with Viton-coated outer sheets, ensures strong sealing capability and superb resistance to corrosion, head lift, and thermal cycling.

Fitment is confirmed for 2002-2007 Honda and Acura models that use these K20A1, K20A2, K20A3, K20Z1, and K24A engines - such as RSX (Base/Type-S), Civic Si, Accord LX/EX/EX-L, CR-V, Element, etc. Note that this gasket is not designed for heads using receiver grooves or block O-rings unless they exactly match the OEM geometry for these engines. Also, proper surface preparation (flat, clean, ≤ 50 RA finish) is essential. For 2025 model years and newer engine variants beyond those listed, fitment is unconfirmed.