FORGED EJ25 ENGINES
The turbocharged EJ25, especially the legendary EJ257, is a legend in the Subaru world. Whether you're chasing big power or just want a rock-solid setup, this forged build eliminates the factory weak points while keeping the signature Subaru character alive.
No More Factory Weaknesses
Our forged EJ25 short block tackles the common EJ25 issues head-on:
✅ Rod Bearings – Upgraded bearings and proper clearances reduce the risk of failure.
✅ Ringlands – Forged Wossner pistons handle more power and stress than stock cast pistons.
✅ Oil Consumption – Precision machining and high-quality components improve oil control.
Precision Machined for Maximum Strength
The engine case starts with seasoned EJ25 case halves, which undergo:
✔️ Bore & Deck Process – Perfectly machined for optimal fitment and alignment.
✔️ Torque-Plate Honed – Ensures precision under real-world torque loads.
✔️ Flawless Decking – Maximizes sealing for long-term reliability.
Stronger, More Reliable Bottom End
At the core of this build is a brand-new OEM Subaru Nitride-Treated Crankshaft, ready to handle serious power. This fits all EJ25 applications, including:
2004-2019 STI
2006-2019 WRX
2004-2008 Forester XT
2005-2009 Legacy GT
2005-2009 Outback XT
Upgraded for Performance & Longevity
🔧 OEM Connecting Rods – Restored to factory spec for perfect oil clearance, reducing rod knock risks.
🛠️ ACL or King Bearings – High-performance rod and main bearings for extreme durability.
🔥 Wossner Forged Pistons – Handles high boost and aggressive tuning far better than stock.
🔩 New Piston Rings & Seals – Ensuring strong compression and efficient oil control.
THE PROCESS
Each engine is fully stripped down and all internal components and tolerances are checked to factory specification. Refurbished or reground crankshafts are never as good as new, so we always use a brand new genuine Subaru crankshaft.
This is fitted back into the cleaned engine case using ACL Trimetal Reinforced Rod Bearings and KING Racing Main Bearings. A full new set of engine block bolts and head stretch bolts are used for reassembly and all internal bearings, seals, gaskets and bolts are replaced with OEM quality or better.
THE RESULTS
Each engine is then refitted to our donor car to test that it is in full working order, filled with Millers competition oil and run for 1 hour to allow to get up to temperature. With everything working perfectly and the engine running smoothly, it is then removed, drained of fluids and ready to be shipped. We can even supply a video of your specific engine running before removal if required.
Supplied engine includes intake manifold, fuel rails, injectors, alternator, air con pump etc. Flywheel and clutch not included. We can also supply a full range of additional modifications and improvements to the engine if required. These include baffled oil sumps, low temperature thermostats, intake spacers, and many more. Just drop us a message to discuss your exact requirements.
Or looking for more power? Check out our forged FA20 engines ready for either turbo or supercharging:
"THAT IS FANTASTIC"
"That is fantastic. I've sent the video to my son. He has got quite emotional. He cannot wait to get his engine back."
Sean - Essex
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