Cometic C4264-051 MLS Head Gasket 100mm .051 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 Version 1, and EJ257 (2004-2006) engine codes - SOHC and DOHC
• EJ255 Version 2 (2007+) and EJ257 (2007-2018) use a different bore size and require the C4574 series - not compatible with C4264-051
• EJ252 was a California-emissions-specific variant of the EJ251 - same bore and head fitment confirmed
• The .051" thickness is one of the most popular choices for performance EJ25 builds with moderate head surfacing
• 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 durable, consistent 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
• Load-controlled embossment design distributes clamping force evenly to minimize bore distortion
• Compatible with aluminum-to-aluminum and aluminum-to-cast-iron head/block combinations
• Precision 100mm bore for accurate fitment across the full EJ25 engine range
• Suitable for both naturally aspirated rebuilds and high-boost turbocharged performance builds
• Race-proven - Cometic is the trusted sealing standard across professional and amateur motorsport

Specifications

• Part Number: C4264-051
• Gasket Type: MLS (Multi-Layer Steel) Cylinder Head Gasket
• Bore Size: 100mm
• Compressed Thickness: 0.051 inches
• Engine Compatibility: Subaru EJ25D, EJ251, EJ252, EJ253, EJ255 Version 1, EJ257 (2004-2006), 2.5L SOHC/DOHC 16V
• Layers: 3-layer stainless steel construction
• Coating: Viton fluoroelastomer (both sides of outer layers)
• UPC: 191070005535
• Position: Cylinder Head (single gasket)
• Drivetrain: AWD / FWD

Included Components

• 1x Cometic MLS Cylinder Head Gasket (C4264-051)

Product Description

The Cometic C4264-051 is a Multi-Layer Steel cylinder head gasket covering the full Subaru EJ25 engine family, from early EJ25D naturally aspirated applications through the high-output EJ257 found in the WRX STI through 2021. With a 100mm bore and a 0.051-inch compressed thickness, it is one of the most widely used thickness options for EJ25 performance builds - well-suited for engines with moderate head surfacing or builds targeting a slight compression reduction. It installs dry with no sealant or re-torque required.

Three embossed stainless steel layers with Viton-coated outer surfaces ensure a reliable, long-lasting seal across naturally aspirated daily drivers and high-boost turbo builds alike. Whether you are replacing a failed head gasket on a Legacy or building a dedicated STI performance engine, the C4264-051 delivers the precise fitment and sealing reliability that Cometic is known for across decades of Subaru motorsport and street applications.