IAG 600 Long Block Engine w/ Stage 2 W25 Heads

2008-2019 Subaru STI

Ships for free in the 48 states

SKU: IAG-ENG-4010WWe price match!

On order from MFG
Average time to ship: 205 business days

The 600 EJ25 Long Block Engine w/ Stage 2 W25 Heads will support up to 600 BHP in the Subaru STI. 
You will earn Reward Points with this Purchase.


IAG 600 EJ25 Long Block Engine w/ Stage 2 W25 Heads

IAG 600 Long Block Specs:

  • Brand new Subaru OEM case halves - bored and honed to 99.75mm
  • IAG Spec JE 99.75mm forged pistons, ring set, 2.10" 9310 steel pins, clips, perfect skirt coated with offset wrist pins
  • IAG Spec Tuff H-Beam connecting rods w/ ARP 2000 rod bolts
  • ACL or King Race main/rod bearings
  • New Subaru nitride treated 2017+ STI crankshaft
  • New Subaru standard FHI case bolts
  • New wrist pin seals, rear main seal, and separator kit
  • New crankshaft woodruff key
  • Rated to 600 BHP


Stage 2 Head Specs:

  • Starts with brand new Subaru OEM WRX/STI cylinder head castings
  • CNC pocket ported
  • GSC 36mm standard intake valves
  • GSC 32mm standard exhaust valves
  • GSC single valve springs and titanium retainers
  • OEM valve guides
  • GSC valve stem seals
  • OEM lifter buckets
  • GSC Stage 2 billet camshafts
  • Multi-angle valve job
  • Machine cam-lobe clearance
  • Resurface
  • Ultrasonic cleaning
  • Final lash
  • ARP 2000 11mm head studs
  • OEM head gaskets
  • OEM valve cover gaskets
  • OEM cam seals
  • OEM valve covers


IAG 600 EJ25 Long Block Engine w/ Stage 2 W25 Heads

The IAG Performance Stage 1 Short Block is a great idea for those of you who want a brand-new replacement motor that has been balanced, blueprinted, and assembled by one of the leaders in the Subaru performance industry. This is a complete valve cover to valve cover assembled long block crate engine that has been assembled with proven performance components to sustain power levels up to 600 BHP.

The IAG 600 is ideal for those of you looking to make up to 600 BHP with the right turbo and fuel setup, and it features IAG's most popular Stage 2 Tuff short block that utilizes a brand new Subaru EJ25 case that is bored to 99.75mm to accept IAG Spec-JE forged pistons, IAG-Spec H-beam connecting rods, and a brand new OEM STI crankshaft. This block is paired with IAG Stage 2 Heads that feature brand new Subaru OEM WRX/STI cylinder head castings that are CNC pocket ported to increase flow while maintaining spool. These heads will include GSC valve train components along with GSC Stage 2 billet camshafts to optimize the ported heads. To complete the package, the heads are fastened using ARP 2000 head studs along with all of the required gaskets for the final assembly. 

0 customer reviews

Average rating
(based on 0 reviews)
Ease of Installation
Fit / Quality
Overall Satisfaction

Write Your Own Review

Only registered users can write reviews. Please, log in or register


No questions have been asked about this product.

Upload images for this product