Description

The IAG 750 Short Block is designed to solve the majority of common problems which plague modified EJ25 engines, especially at higher horsepower levels. The IAG 750 short block builds off our IAG 550 block's strengths by adding our proprietary closed deck system. This system strengthens and supports the cylinder walls to prevent cracks which can occur with increased cylinder pressures. (This is the most common issue when increasing horsepower.) The IAG 750 also features 99.75mm JE Forged Pistons and IAG Spec H beam connecting rods, along with ACL or King Race bearings. These components also significantly strengthen the common failure points such as cracked ring lands and spun bearings. The IAG 750 Short Block starts with brand new Subaru 2.5L engine case halves. Our machinists machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts, transforming the block into a solid deck. Next, a deck pair of deck plates are attached and the short block is bored and honed to 99.75mm in our in-house Sunnen SV-30 computer controlled cylinder hone. IAG's in-house honing process allows us to set custom piston to wall clearances to ensure quiet operation and reduced oil consumption. The modified case halves are then assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft and IAG-Spec Tuff H-Beam connecting rods with ARP rod bolts. IAG Short blocks feature ACL or King Race rod and main bearings. Finally, the case halves are sealed with new OEM main/case bolts and sealant.

Specifications

IAG 750 EJ25 2.5L Closed Deck Short Block:

  • Case Halves - Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 99.75mm.
  • Pistons - IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Ring Set, .210" 9310 Steel Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
  • 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.

Compression Ratio:

  • 8.5:1 on D Cylinder Heads (EJ255)
  • 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket.

Compatibility

  • 2005-2006 Saab 9-2X Aero
  • 2004-2006 Subaru Baja Turbo
  • 2008 Subaru Forester 2.5 XT
  • 2008 Subaru Forester Sports 2.5 XT
  • 2004 Subaru Forester XT
  • 2006 Subaru Forester XT Limited
  • 2005-2013 Subaru Forester XT Premium
  • 2010-2012 Subaru Forester XT Sports
  • 2011-2013 Subaru Forester XT Touring
  • 2009-2010 Subaru Impreza 2.5 GT
  • 2002 Subaru Impreza WRX
  • 2010 Subaru Impreza WRX GT
  • 2006-2013 Subaru Impreza WRX Limited
  • 2009-2012 Subaru Impreza WRX Premium
  • 2010 Subaru Impreza WRX SE
  • 2004 Subaru Impreza WRX STI
  • 2007-2012 Subaru Impreza WRX STI Limited
  • 2010 Subaru Impreza WRX STI Special Edition
  • 2006-2007 Subaru Impreza WRX TR
  • 2005 Subaru Legacy GT
  • 2005-2009 Subaru Legacy GT Limited
  • 2006-2009 Subaru Legacy GT spec.B
  • 2008 Subaru Outback 2.5 XT
  • 2005-2008 Subaru Outback XT
  • 2005-2009 Subaru Outback XT Limited
  • 2012-2021 Subaru WRX STI

The IAG 750 Short Block is designed to solve the majority of common problems which plague modified EJ25 engines, especially at higher horsepower levels. The IAG 750 short block builds off our IAG 550 block's strengths by adding our proprietary closed deck system. This system strengthens and supports the cylinder walls to prevent cracks which can occur with increased cylinder pressures. (This is the most common issue when increasing horsepower.) The IAG 750 also features 99.75mm JE Forged Pistons and IAG Spec H beam connecting rods, along with ACL or King Race bearings. These components also significantly strengthen the common failure points such as cracked ring lands and spun bearings. The IAG 750 Short Block starts with brand new Subaru 2.5L engine case halves. Our machinists machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts, transforming the block into a solid deck. Next, a deck pair of deck plates are attached and the short block is bored and honed to 99.75mm in our in-house Sunnen SV-30 computer controlled cylinder hone. IAG's in-house honing process allows us to set custom piston to wall clearances to ensure quiet operation and reduced oil consumption. The modified case halves are then assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft and IAG-Spec Tuff H-Beam connecting rods with ARP rod bolts. IAG Short blocks feature ACL or King Race rod and main bearings. Finally, the case halves are sealed with new OEM main/case bolts and sealant.

IAG 750 EJ25 2.5L Closed Deck Short Block:

  • Case Halves - Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 99.75mm.
  • Pistons - IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Ring Set, .210" 9310 Steel Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
  • 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.

Compression Ratio:

  • 8.5:1 on D Cylinder Heads (EJ255)
  • 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket.
  • 2005-2006 Saab 9-2X Aero
  • 2004-2006 Subaru Baja Turbo
  • 2008 Subaru Forester 2.5 XT
  • 2008 Subaru Forester Sports 2.5 XT
  • 2004 Subaru Forester XT
  • 2006 Subaru Forester XT Limited
  • 2005-2013 Subaru Forester XT Premium
  • 2010-2012 Subaru Forester XT Sports
  • 2011-2013 Subaru Forester XT Touring
  • 2009-2010 Subaru Impreza 2.5 GT
  • 2002 Subaru Impreza WRX
  • 2010 Subaru Impreza WRX GT
  • 2006-2013 Subaru Impreza WRX Limited
  • 2009-2012 Subaru Impreza WRX Premium
  • 2010 Subaru Impreza WRX SE
  • 2004 Subaru Impreza WRX STI
  • 2007-2012 Subaru Impreza WRX STI Limited
  • 2010 Subaru Impreza WRX STI Special Edition
  • 2006-2007 Subaru Impreza WRX TR
  • 2005 Subaru Legacy GT
  • 2005-2009 Subaru Legacy GT Limited
  • 2006-2009 Subaru Legacy GT spec.B
  • 2008 Subaru Outback 2.5 XT
  • 2005-2008 Subaru Outback XT
  • 2005-2009 Subaru Outback XT Limited
  • 2012-2021 Subaru WRX STI

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