GrimmSpeed EJ25 Head Gasket Sets

If you're a Subaru owner looking to push the limits of your engine's performance, the GrimmSpeed EJ25 Head Gasket Sets are an essential upgrade for your build. Known for their unparalleled quality in the aftermarket world, GrimmSpeed has engineered these head gaskets to meet the demands of everything from a simple engine refresh to a high-horsepower track setup.

Why Choose GrimmSpeed Head Gaskets?

These gaskets are crafted with a multi-layer steel (MLS) construction that ensures optimal sealing of both the surface and combustion chamber. The top and bottom layers are coated with a Nitrile Rubberized finish, allowing them to accommodate rougher surface finishes up to 50 microinches. This feature significantly enhances sealing in non-critical areas, reducing the risk of leaks under high cylinder pressures—ideal for built engines that demand reliability.

Customizable Options for Every Build

Understanding that every engine build is unique, GrimmSpeed offers these gaskets in various thicknesses: 0.78mm, 1.1mm, and 1.5mm. This flexibility allows you to fine-tune your setup precisely. Additionally, the slightly oversized bore diameters let you accommodate up to a 0.5mm overbore, making these gaskets versatile for a range of applications.

Enhanced Features for High Power Builds

Designed specifically for the EJ25 engine family, these gaskets feature enlarged center head bolt holes to support up to 13mm head studs. This is a crucial upgrade for those looking to increase clamping force, ensuring that your head gaskets can handle the extra power without failure.

Key Features:

• Sold as a Set/Pair - Compatible with both Single and Dual AVCS setups
• Die Cut Multi-Layer Stainless Steel (MLS) Construction - Ensures consistency with a manufacturing tolerance of ±0.001''
• Folded Stopper Layer for superior combustion chamber sealing
• 0.25-micron Nitrile Rubber Layer Coating - Minimizes leak potential on imperfect mating surfaces
• Accommodates up to 100.0mm bore
• Compatible with up to 13mm (1/2'') studs
• Available in thicknesses of 0.78mm, 1.1mm, and 1.5mm (after crushing)

Fitment:

• Subaru STI 2004-2007
• Subaru WRX 2008-2014
• Subaru Forester XT 2004-2008

Customer Feedback

Subaru STI owners rave about the GrimmSpeed gaskets for their reliability under pressure. One customer noted, "I installed these on my 2005 STI, and they held up perfectly during my track days. No leaks, even when pushing over 400hp!"

Upgrade your Subaru with the GrimmSpeed EJ25 Head Gasket Sets and experience the quality and performance that comes from years of engineering expertise.