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IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
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User Media for: IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
User Media for: IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)

IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block

Subaru Models (inc. 2002-2014 WRX / 2004+ STI)

Read 2 Reviews | 15 Q&As
Part # IAG-ENG-1252
$4,319.99

Only 2 left!
ANY QUESTIONS?

Features & Product Details

RallySport Direct carries the highly sought-after high-performance upgrades and accessories brought to you by IAG Performance. Whether you’re building a mild street car, or an all out rally car, or just looking for dead reliable power from your Overlander build, look no further than IAG!

 

The IAG Performance Stage 2.5 Hybrid Closed-Deck Short Block has been designed for power-hungry enthusiasts who want to increase the displacement and low-end torque of their Subaru that was originally equipped with the EJ20 2.0 engine.  The Hybrid 2.5 features pistons that are designed to lower the compression and math the EJ20 cylinder heads without the need to modify the cylinder head chamber. 

Each 2.5L Hybrid Shortblock will start with a brand new Subaru 2.5L engine case halves in which IAG machines them, and they are assembled together in-house and are CNC milled 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 short block is then deck plate bored and honed to 99.75mm in IAG's in-house cylinder hone. The modified case halves are then assembled using a brand new 2017+ 2.5L nitride-treated STI crankshaft that is matched to ACL rod and main bearings. The rest of the blueprinted engine features IAG-Spec JE FSR 99.75mm 2618 forged pistons w/ skirt coating, and IAG Spec Tuff H-Beam connecting rods that are assembled with ARP 2000 rod bolts.

This is a great rebuild option for those of you who want an assembled short block built by one of the best industry-leading performance shops available and is rated to 700 BHP. 

 

 

SPECS:

  • Brand new Subaru OEM case halves converted to Closed Deck 
  • Unique inserts on the block feature small passages that allow needed coolant flow to the deck surface
  • Bored and honed to 99.75mm
  • IAG-Spec JE FSR 99.75mm 2618 forged pistons w/ skirt coating 
  • .180" Chromoly wrist pins
  • IAG Spec Tuff H-Beam connecting rods
  • ARP2000 Rod bolts
  • ACL Rod and Main Bearings
  • Standard new Subaru Nitride Treated 2017+ STI crankshaft
  • Standard FHI Subaru case bolts/main bolts
  • Supports up to 700 BHP
  •  

     

     

    NOTES:
  • Compression ratio with D cylinder heads: 8.5:1
  • Compression ratio with B, V, and W EJ257 heads with standard thickness gasket: 8.2:1
  •    

     

     

    Specifications

    Brand: IAG Performance
    Bore Size (mm): 99.75
    Compression Ratio: 8.2:1
    Crank: OEM Forged
    Crank Size: OEM
    Displacement: 2.5L
    Piston Material: Forged Aluminum
    Power Output Rating (BHP): 675
    Rods: Forged
    Mfgr. Warranty: 12 Months / 12k Miles
    Condition: New Product
    Return Policy:
    Standard

    PEOPLE WHO VIEWED THIS ITEM ALSO VIEWED

    REVIEWS & CUSTOMER MEDIA

    2 Reviews
    5 out of 5 Stars
    5 Stars
    (2)
    4 Stars
    (0)
    3 Stars
    (0)
    2 Stars
    (0)
    1 Stars
    (0)
    Customer Photos and Videos
    IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block ( Part Number: IAG-ENG-1252)
    IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block ( Part Number: IAG-ENG-1252)
    Excellent! 7 months ago
    5out of 5stars
    Ozzy V.
    Went closed-deck after my cylinder 4 piston cracked. Much better engine overall, and you might even get a warranty out of it depending on who installs it. IAG as always making excellent products and they stand behind their work!
      
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    2 of 2 people found the following review helpful
    10/10 for IAG and RSD 1 year ago
    5out of 5stars
    Eulises
    Oem block spun a bearing @60k miles while on FBO and e85. Went with this block and have been impressed by it so far. And also while knowing I no longer have oem cast pistons lol. RSD supplied the block with fast shipping, expedited shipping when I didn't even pay for that kind of shipping which is a plus for me. Block arrived with other parts I ordered accurately and no mistakes on my order. TY RSD and IAG. Hoping for this break-in period to go by fast now.
      
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    QUESTIONS & ANSWERS

    • Q: Would there be any short blocks that fit in a 2.5i Premium Sedan Impreza?  daGi1 year ago

      I wanna build my impreza but there is no fit for my car
      • 0 of 0 people found the following answer helpful

        A:  In theory anything is possible, however the cost of an IAG block and necessary mods would quickly out weigh the cost of buying a WRX.

        Lane H. @ RallySport Direct 11 months ago  
          
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    • Q: Fitment  R Car1 year ago

      Title Says: "Subaru Models (inc. 2002-2014 WRX / 2004+ STI)" but fitment chart lists no 2002 or 2003 models. Please clarify and correct fitment info. Thanks.
      • 1 of 1 people found the following answer helpful

        A:  The reason this is not listed on the fitment chart for 02-03 WRX is because they have the EJ205, so it is not a direct fitment. It can be used in the 02-03 WRX but you'll need additional parts for it to work properly.

        Jesse F. @ RallySport Direct 1 year ago  
          
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    • Q: Rev Limit  Neuspeed1 year ago

      What is the rev limit for this engine?
      • 0 of 0 people found the following answer helpful

        A:  That's more so dependent on what head work you have done. ie Valves, springs, retainers, seals and cams. You would also need the JDM 12mm oil pump on this block to support the power levels it is rated for, especially if you decide to run the engine above the factory rev limit/ fuel cut.

        Maverick
          
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    • Q: Block work   Iag closed deck block 1 year ago

      I got a block I want to get closed deck do y’all do the job if I set my block in to get it Build or do I have to buy one of f the shelf
      • 0 of 0 people found the following answer helpful

        A:  I would reach out to IAG directly, as they would be the ones doing the work. Ultimately it might be cheaper/easier to just buy one off the shelf, but they will be able to help you make that decision. Thanks!

        Rick C. @ RallySport Direct 1 year ago  
          
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