Cometic C4264-040 MLS Head Gasket 100mm .040 for Subaru EJ25 2.5L SOHC/DOHC 16V

Vehicle Fitment

• 1996-1999 Subaru Legacy (GT, LSi, Outback, AWD/FWD, 2.5L H4 EJ25D DOHC 16V)
• 1999-2004 Subaru Legacy (L, GT, Outback, AWD, 2.5L H4 EJ251 SOHC 16V)
• 2000-2002 Subaru Legacy / Outback (AWD, 2.5L H4 EJ252 SOHC 16V - California emissions)
• 2005-2012 Subaru Legacy GT (AWD, 2.5L H4 EJ255 DOHC 16V Turbo)
• 1998-1999 Subaru Impreza (RS, L, Outback Sport, AWD/FWD, 2.5L H4 EJ25D DOHC 16V)
• 1999-2005 Subaru Impreza (RS, L, Outback Sport, AWD/FWD, 2.5L H4 EJ251/EJ253 SOHC 16V)
• 2006-2014 Subaru Impreza WRX (AWD, 2.5L H4 EJ255 DOHC 16V Turbo)
• 2004-2014 Subaru Impreza WRX STI (AWD, 2.5L H4 EJ257 DOHC 16V Turbo)
• 2015-2021 Subaru WRX STI (AWD, 2.5L H4 EJ257 DOHC 16V Turbo)
• 1997-1998 Subaru Forester (L, S, AWD, 2.5L H4 EJ25D DOHC 16V)
• 1999-2004 Subaru Forester (L, S, AWD, 2.5L H4 EJ251 SOHC 16V)
• 2004-2013 Subaru Forester XT (AWD, 2.5L H4 EJ255 DOHC 16V Turbo)
• 1996-1999 Subaru Outback (AWD, 2.5L H4 EJ25D DOHC 16V)
• 2000-2004 Subaru Outback (AWD, 2.5L H4 EJ251 SOHC 16V)
• 2005-2009 Subaru Outback XT (AWD, 2.5L H4 EJ255 DOHC 16V Turbo)
• 2003-2005 Subaru Baja (AWD, 2.5L H4 EJ251 SOHC 16V)
• 2004-2006 Subaru Baja Turbo (AWD, 2.5L H4 EJ255 DOHC 16V Turbo)

Fitment Notes

• Compatible with EJ25D, EJ251, EJ252, EJ253, EJ255, and EJ257 engine codes across SOHC and DOHC configurations
• EJ252 was a California-emissions-specific variant of the EJ251 - same bore and head fitment confirmed
• The .040" thickness suits standard engine rebuilds and mildly resurfaced head/block surfaces
• Does not fit EJ20 or EJ22 engines
• Sold individually - one gasket per listing (single cylinder bank); 2 required per complete engine build

Features

• Multi-Layer Steel (MLS) construction with three embossed stainless steel layers for reliable, high-strength sealing
• Outer layers coated with Viton fluoroelastomer rubber - heat resistant up to 482°F (250°C)
• No sealant required and no re-torque needed - installs dry on properly prepared surfaces
• Embossed design distributes clamping load evenly to minimize bore distortion
• Compatible with aluminum-to-aluminum and aluminum-to-cast-iron head/block configurations
• Precision 100mm bore ensures accurate fitment across the full EJ25 engine family
• Handles both naturally aspirated and high-boost turbocharged applications
• Trusted by professional and amateur motorsport teams worldwide

Specifications

• Part Number: C4264-040
• Gasket Type: MLS (Multi-Layer Steel) Cylinder Head Gasket
• Bore Size: 100mm (3.397 in.)
• Compressed Thickness: 0.040 inches
• Engine Compatibility: Subaru EJ25D, EJ251, EJ252, EJ253, EJ255, EJ257, 2.5L SOHC/DOHC 16V
• Layers: 3-layer stainless steel construction
• Coating: Viton fluoroelastomer (both sides of outer layers)
• UPC: 191070002213
• Position: Cylinder Head (single gasket)
• Drivetrain: AWD / FWD

Included Components

• 1x Cometic MLS Cylinder Head Gasket (C4264-040)

Product Description

The Cometic C4264-040 is one of the most versatile MLS cylinder head gaskets in the EJ25 lineup, covering the full range of Subaru's 2.5L boxer engine family from 1996 through 2021. With a 100mm bore and 0.040-inch compressed thickness, it is engineered for standard engine rebuilds, head gasket replacements, and performance builds where head and block surfaces are stock or only lightly resurfaced. Compatible across EJ25D, EJ251, EJ252, EJ253, EJ255, and EJ257 engine codes, it fits naturally aspirated models and high-output turbocharged platforms including the WRX, STI, Legacy GT, and Forester XT.

Built from three embossed stainless steel layers with Viton-coated outer surfaces, the C4264-040 delivers a consistent, sealant-free seal that resists the head gasket failures the EJ25 platform is known for. No re-torque is required, and the load-controlled embossment design minimizes bore distortion for long-term sealing integrity. Whether you are restoring a naturally aspirated Legacy or building a high-boost STI, this gasket provides the precision fitment and durability that Cometic is trusted for across decades of Subaru performance applications.