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IAG Performance

IAG - 06-14 WRX/04-21 STI/04-13 FXT/05-09 LGT - 600 Long Block Engine w/ Stage 2 Heads

IAG - 06-14 WRX/04-21 STI/04-13 FXT/05-09 LGT - 600 Long Block Engine w/ Stage 2 Heads

Regular price $9,974.99 USD
Regular price Sale price $9,974.99 USD
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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. 



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

    *If you need more information about this engine block, please don't hesitate to call us at 503-619-0055 for expert advice.

    *All IAG Engine Blocks are engineered, balanced, and blueprinted per your order and shipped in crates by freight trucks. Please allow an extended shipping duration. Contact one of our specialists for more information. 



    • Subaru 06-14 WRX
    • Subaru 04-21 STI
    • Subaru 04-13 Forester XT
    • Subaru 05-09 Legacy GT
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