IAG Stage 1 2.5L Subaru Short Block For WRX, STI, Legacy GT & Forester XT

IAG Stage 1 2.5L Subaru Short Block for WRX, STI, Forester XT and Legacy GT
IAG Stage 1 2.5L Built Subaru Short Block

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MSRP: $3,044.99
Our Price: $2,899.99
Savings: $145.00

Availability: Usually Ships in 2 to 3 Weeks
Part#: IAG-ENG-1000

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

Description Warranty Information Applications

IAG Stage 1 Short Block

The IAG Stage 1 Short Block is perfect for lightly modified EJ25 Subaru's that need a basic and reliable performance short block. Subaru turbo engines are commonly known for piston ring land failures and if gone unchecked lead to rod knock and total engine failure due to oil starvation from blow by. IAG's Stage 1 Short Block includes upgraded forged pistons along with performance main and rod bearings that replace the OEM components that are prone to common failure on Stage 2 and up vehicles. Each IAG Stage 1 Short Block starts with new Subaru 2.5L 99.5mm bore EJ25 engine case halves as standard. The short block is measured and assembled using a new 2017+ Nitride Treated Subaru 2.5L STI crankshaft that is matched to ACL or King main bearings. Early style OEM STI rods are utilized along with ACL or King rod bearings. The case halves are sealed with new OEM case bolts and sealant. Finally, 99.5mm IAG-Spec Forged Pistons are spec'd and installed finishing off the short block.

The IAG Stage 1 Short Block has a power output rating of 475BHP.

Stage 1 Short Block Includes:
  • Case Halves - Brand new Subaru OEM case halves 99.5mm Stock Bore
  • Pistons - IAG-Spec 99.5mm Forged Pistons, Ringset, Chrome-moly Steel Pins, Clips, (Coated Skirts and Offset Wrist Pin)
  • Connecting Rods - Early OEM (Stronger Style) STI rods
  • Rod / Main Bearings - ACL or King Bearings
  • Crankshaft - Standard New Subaru Nitride Treated 2017+ STI Crankshaft
  • Case / Main Bolts - Standard FHI Subaru case bolts

Additional Options Available:
  • Hardware / Seals - OEM cover and seal kit - $105.99

*All IAG short blocks are balanced and blueprinted.

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

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.
Features / Specs
IAG-Spec 99.5mm Pistons, Ringset, Chrome-moly Pins and Clips (w/ Coated Skirts and Offset Wrist Pin)
New FHI Subaru Case Halves at 99.5mm stock bore
New FHI Subaru Early STI (Stronger Style) Connecting Rods
New FHI Subaru Nitride Treated 2017+ STI Crankshaft
ACL or King Rod Bearings
ACL or King Main Bearings
New FHI Main Case Bolts
IAG Spec Blueprint Sheet
Power Output Rating: 475BHP

Average Rating: 5 of 5 Total Reviews: 7 Write a review »

  0 of 0 people found the following review helpful:
Stage 1 Block for Subaru Outback XT August 2, 2018
Reviewer: Gerry Carney from Highlands Ranch, CO United States  
My Son's Subaru Engine is being rebuilt now with the Staged 1 forged block. We chose this based on the reviews and hoping for longevity. I will post more in the months to come on the performance

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  0 of 0 people found the following review helpful:
Excellent service April 26, 2018
Reviewer: Anonymous Person from King George, VA United States  
The short block motor I received exceeded my expectation. It was like a brand new motor. The top end fit perfect when installed on the short block. I will recommend all of my friends to them.

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  0 of 0 people found the following review helpful:
Smooth April 25, 2018
Reviewer: Dean Bailey from Winthrop, ME United States  
The engine was Processed quickly and I received it without damage. The whole process was painless and without issue. I would purchase from IAG again. Great job!!!!!

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  0 of 0 people found the following review helpful:
Stage 1 block purchase February 22, 2018
Reviewer: Nathaniel Wilson from Orient , OH United States  
Great customer service and fast delivery time. We buy all of our short blocks from IAG.

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  0 of 0 people found the following review helpful:
Extremely happy! January 8, 2018
Reviewer: jeremy swyers from sault ste. marie, ON Canada  
Very fast shipping even considering the holiday season. Great customer service as well. The employee I spoke with really put my mind at ease about spending over 3000 Canadian dollars. I'm very satisfied with my experience and will 100% purchase more items from iag. My only complaint is no iag stickers came with my block. No big deal though the engine will speak for itself I'm sure.

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