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IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block (Part Number: )
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block (Part Number: )
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block (Part Number: )
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block (Part Number: )
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block (Part Number: )
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block (Part Number: )
IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block
Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
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Part # IAG-ENG-1252
$3,999.99
msrp: $4,199.99

In stock! Ships same day

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Features & Product Details

RallySport Direct now carries highly sought-after high-performance upgrades and accessories brought to you by IAG Performance. 

On this page, you are looking at the IAG Performance Stage 2.5 EJ25 Subaru Closed Deck Short Block. This is a carefully blueprinted and assembled engine block designed to handle the perils of increased power and torque output. This is a brand new engine with new Subaru case halves with all the right guts machined and assembled with a Haas VF-4SS mill to accept the IAG Closed Deck inserts. 

Here are the details:

  • 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
  • Note: Compression ratio is subject to change based on cylinder heads and head gaskets used. 

  • 8.2:1 on B, V, and W cylinder heads (EJ257)
  • 8.5:1 on D cylinder heads (EJ255)
  • 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:

    RallySport Guarantee - 30 Days


    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.
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