IAG Stage 2 Tuff 2.5L Subaru Short Block for WRX, STI, Legacy GT, Forester XT
The IAG Stage 2 Tuff short block starts with new Subaru 2.5L EJ25 engine case halves that are bored and honed to 99.75 on our in-house Sunnen SV-30 the most advanced automotive cylinder hone available. IAG's in-house honing process is able to set piston to wall clearances tighter for a quieter running engine. The short block is measured and assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft that is matched to ACL or King race main bearings. Next, IAG-Spec Tuff H-Beam rods with ARP Rod Bolts are utilized to increase the power rating slightly at the expense of being slightly heavier. The connecting rods are matched to ACL or King race rod bearings. The case halves are sealed with new OEM main case bolts and sealant. Finally, IAG-Spec JE 99.75mm Forged Pistons are added to finish off the short block.
Stage 2 Tuff Short Block Includes:
Case Halves - Brand new Subaru OEM case halves, bored and honed to 99.75mm.
Pistons - IAG-Spec JE 99.75mm Forged Pistons, Ring Set, .180" Chromoly Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
Connecting Rods - IAG-Spec Tuff H-Beam / ARP2000 Rod Bolts.
Rod / Main Bearings - ACL or King Race bearings.
Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft.
Case / Main Bolts – Standard FHI Subaru case bolts.
8.5:1 on D Cylinder Heads (EJ255)
8.2:1 on B, V and W EJ257 Heads with standard thickness gasket.
Power: The IAG Stage 2 Tuff Short Block has a power output rating of 625BHP.
*All IAG short blocks are balanced and blueprinted.
Not planning on reusing your original short block service plugs and covers? IAG offers a simple comprehensive OEM cover and seal kit that includes (1) Rear main seal, (3) wrist pin plugs, (3) wrist pin plug washers, (1) separator cover, (6) separator cover bolts, (1) wrist pin service cover, (1) wrist pin service cover O-ring and (2) wrist pin service cover screws. *If you are reusing your original wrist pin service plugs and covers always replace the (3) wrist pin plug washers and (1) wrist pin service cover O-ring before installing a short block to avoid potential leaks. *Never reuse a rear main seal on a new short block.
Model Year & Fitment
2002-2005 Subaru WRX (Requires Mods)
2006-2014 Subaru WRX
2004-2018 Subaru STI
2005-2009 Subaru Legacy GT
2004-2013 Subaru Forester XT
This product can expose you to chemicals including Lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov