IAG Stage 3 Tuff EJ25 Subaru Closed Deck Short Block For WRX, STI, LGT, FXT
IAG Stage 3 Tuff Subaru EJ25 Closed Deck Short Block
The IAG Stage 3 Tuff Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that transform the block into a solid deck. The unique inserts feature small passages that allow needed coolant flow to the deck surface. The case is drilled and tapped to accept larger 1/2" head studs for which aids in preventing cylinder heads from lifting in high boost applications. Next the short block is Deck Plate bored and honed to 99.75mm in our in-house Sunnen SV-10. IAG‘s in house honing process is able to set custom piston to wall clearances to best fit your needs. The modified case halves are then assembled using a new 2012+ Subaru 2.5L heat-treated STI crankshaft (or Manley Billet add $1300) that is matched to ACL or King race main bearings. Manley Turbo Tuff I-Beam connecting rods and ARP rod bolts are utilized along with ACL or King race rod bearings. The case halves are sealed with new OEM main/case bolts and sealant (upgrade to ARP mains and line hone service a la carte). Manley Turbo Tuff 99.75mm Forged Pistons are chosen to finish the Stage 3 Tuff short block.
Stage 3 Tuff Closed Deck Includes:
- Case Halves - Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 99.75mm.
- Head Studs - Machine case to fit 1/2 inch head studs - *Head studs sold separately
- Pistons - Manley Turbo Tuff 99.75mm Forged Pistons / .170 inch wall tool steel wrist pins
- Connecting Rods - Manley Turbo Tuff I-Beam / ARP2000 Rod Bolts.
- Rod / Main Bearings - ACL or King Race bearings.
- Crankshaft - Standard New Subaru Heat-Treated 2012+ 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.
Head Gasket Recommendations:
- *IAG Recommends JE Pro Seal .039 inch head gaskets for B and D casting cylinder heads.
- *IAG Recommends Cosworth 1.1mm head gaskets for all V and W casting cylinder heads
The IAG Stage 3 Tuff Short Block has power output rating of 900BHP.
*All IAG short blocks are balanced and blueprinted.
Model Year & Fitment
- 2002 Subaru WRX (Requires Mods)
- 2003 Subaru WRX (Requires Mods)
- 2004 Subaru WRX (Requires Mods)
- 2005 Subaru WRX (Requires Mods)
- 2006 Subaru WRX
- 2007 Subaru WRX
- 2008 Subaru WRX
- 2009 Subaru WRX
- 2010 Subaru WRX
- 2011 Subaru WRX
- 2012 Subaru WRX
- 2013 Subaru WRX
- 2014 Subaru WRX
- 2004 Subaru STI
- 2005 Subaru STI
- 2006 Subaru STI
- 2007 Subaru STI
- 2008 Subaru STI
- 2009 Subaru STI
- 2010 Subaru STI
- 2011 Subaru STI
- 2012 Subaru STI
- 2013 Subaru STI
- 2014 Subaru STI
- 2015 Subaru STI
- 2016 Subaru STI
- 2005 Subaru Legacy GT
- 2006 Subaru Legacy GT
- 2007 Subaru Legacy GT
- 2008 Subaru Legacy GT
- 2009 Subaru Legacy GT
- 2010 Subaru Legacy GT
- 2011 Subaru Legacy GT
- 2012 Subaru Legacy GT
- 2004 Subaru Forester XT
- 2005 Subaru Forester XT
- 2006 Subaru Forester XT
- 2007 Subaru Forester XT
- 2008 Subaru Forester XT
- 2009 Subaru Forester XT
- 2010 Subaru Forester XT
- 2011 Subaru Forester XT
- 2012 Subaru Forester XT
- 2013 Subaru Forester XT