BRAND: IAG Performance

IAG - Subaru 08-21 STI - 1000+ EJ25 Closed Deck Long Block w/ Stage 5 Heads


Sale price Price PRICE: $17,324.99 Regular price Unit price  per 

The IAG 1000+ Long Block is a complete, valve cover to valve cover, crate engine. It is the perfect option for ease of installation and gives you a premier "drop-in" engine.

This kit will support up to 1000+BHP applications. IAG's break-in instructions MUST be followed and the package must be professionally installed for the 12 months / 12k mile warranty to be applicable. All IAG Short Blocks are balanced and blueprinted.



  • Stage 5 Heads:
  • Heads - Brand New Subaru OEM WRX STI Cylinder Head Castings
  • Machine Porting - CNC Ported Intake and Exhaust Runners
  • Intake Valves - Ferrea 37mm (+1mm) Comp Plus Intake Valves
  • Exhaust Valves - Ferrea 33mm (+1mm) Comp Plus Exhaust Valves
  • Springs / Retainers - Ferrea Dual Valve Springs & Titanium Retainers
  • Keepers - Ferrea Valve Keepers
  • Guides - Ferrea Copper / Bronze Valve Guides
  • Valve Seals - Ferrea Valve Stem Seals
  • Lifters - OEM Lifter Buckets
  • Camshafts - GSC Stage 3 Billet Camshafts
  • Multi-Angle Valve Job
  • Machined Cam Lobe Clearance
  • Drilled For 14mm Heads Studs
  • Resurface
  • Ultrasonic Cleaning
  • Final Lash
  • Gaskets, Hardware & Accessories:
  • Head Studs - IAG / ARP 14mm Set
  • Head Gaskets - IAG Fire-Lock
  • Valve Cover Gaskets - OEM
  • Cam Seals - OEM
  • Valve Covers - OEM
  • Wrist Pin Seal, Rear Main Seal & Separator Kit
  • Crankshaft Woodruff Key

*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 08-21 WRX STI