IAG Stage 2.5 EJ25 Subaru Closed Deck Short Block For WRX, STI, LGT, FXT

IAG Stage 2.5 Closed Deck EJ25 2.5L Subaru Short Block for WRX, STI, Forester XT and Legacy GT.
IAG Stage 2.5 Closed Deck Subaru EJ25 Short Block


 
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MSRP: $4,199.99
Our Price: $3,999.99
Savings: $200.00

Availability: Usually Ships in 24 to 72 Hours
Part#: IAG-ENG-1252


Oil Pickup*:
IAG Oil Pickup PN# IAG-ENG-2081 [Add $129.99]
Not Required

Head Gaskets*:
JE Pro Seal Gaskets - 1 Pair PN# SB1001-039 [Add $96.00]
JE Pro Seal Gaskets - 1 Pair PN# SB1003-039 [Add $196.58]
Not Required

Oil Pump*:
Subaru JDM 12mm Oil Pump Part# 15010AA310 [Add $219.00]
Subaru 11mm Oil Pump Part# 15010AA360 [Add $199.95]
Not Required

Seal Kit*:
Wrist Pin / Cover Seals P# IAG-ENG-1720 [Add $105.99]
Not Required

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Description Warranty Information Applications
 
IAG Stage 2.5 Subaru EJ25 Closed Deck Short Block

The IAG Stage 2.5 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. Next, the short block is Deck Plate bored and honed to 99.75mm in our in-house Sunnen SV-30 the most advanced automotive cylinder hone available. 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 2017+ Subaru 2.5L nitride treated STI crankshaft that is matched to ACL or King race main bearings. IAG-Spec Tuff H-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 (upgrading to ARP mains requires line honing). Finally, IAG-Spec 99.75mm JE FSR 2618 Forged Pistons with .180" Chromoly Wrist Pins are added to finish the Stage 2.5 short block.

Stage 2.5 Closed Deck Includes:
  • 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, .180" Chromoly 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.

Additional Options Available:
  • Oil Pump - Subaru JDM 12mm High Volume Oil Pump - $219 or 11mm Subaru Oil Pump - $199.95
  • Head Gaskets - JE Pro Seal .039 inch Head Gaskets - (PN# SB1001-039 for D25 & B25 Heads, PN# SB1003-039 for V25, W25 & N25 Heads)
  • IAG Oil Pickup - Upgraded oil pickup featuring heavy gauge steel tubing, 2 point bracket & mesh filter - $129.99
  • Hardware / Seal Option - $105.99 (Wrist pin plugs, washers, separator cover, bolts, etc. In case you don’t want to transfer from the original engine).

Compression Ratio:
  • 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


Power: The IAG Stage 2.5 Short Block has a power output rating of 675BHP.

*All IAG short blocks are balanced and blueprinted.



Hardware / Seal Option:

Subaru EJ25 Seal Kit
Not planning on reusing your original short block service plugs and covers? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal, (3) OEM wrist pin plugs, (3) OEM wrist pin plug washers, (1) OEM separator cover, (6) OEM separator cover bolts, (1) OEM wrist pin service cover, (1) OEM wrist pin service cover O-ring and (2) OEM wrist pin service cover screws. *If you are reusing your original wrist pin service plugs and covers always replace the (3) OEM 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.



Please review the PDF document below regarding installation, break-in procedures and warranty information.

PDF After Sale Document - Contains Shipping, Engine Care and Warranty Information


WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov.



Average Rating: 5 of 5 Total Reviews: 3 Write a review »

  0 of 0 people found the following review helpful:
 
5 Stars April 15, 2019
Reviewer: samson darrah from fairbanks, AK United States  
5 Stars

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  0 of 0 people found the following review helpful:
 
Two years ago March 26, 2019
Reviewer: Paul Harrah from Louisville, KY United States  
As the title says, two years ago on 3/6/17 I started my IAG Stage 2.5 for the first time. It was a very happy and exciting day. Since then, following the recommended oil changes and break in procedure shes still going strong. The block along with the e85 tune from Johnson tuning and the supporting mods have treated me well and continue to bring a smile to my face. This spring will bring the new tune on the BCP500+ turbo. Expected power output will be 550HP and I know this amazing engine will be able to handle it and still have some room left for more. Thank you again IAG!

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  0 of 0 people found the following review helpful:
 
Bruh January 30, 2019
Reviewer: Jonathan De La Rosa from Lancaster, CA United States  
So I ordered a FMIC from IIR and this damn shortblock got here faster than it did. The emails are super informative and I didn’t have to worry about where my block was! I haven't installed it yet but when I do, I'll be sure do drop pictures of the dt I sheet

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