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IAG Performance

IAG - Subaru 06-14 WRX/07-09 LGT/04-13 FXT - 700 EJ25 Closed Deck Long Block w/ Stage 3 D25 Heads

IAG - Subaru 06-14 WRX/07-09 LGT/04-13 FXT - 700 EJ25 Closed Deck Long Block w/ Stage 3 D25 Heads


Regular price $11,024.99 USD
Regular price Sale price $11,024.99 USD
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Shipping calculated at checkout.

The IAG 700 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 700BHP 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.

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, .210" 9310 Steel 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.

  • Stage 3 Heads:
  • Heads - Brand New Subaru OEM WRX STI Cylinder Head Castings
  • Machine Porting - CNC Pocket Ported
  • Intake Valves - GSC 37mm (+1mm) Intake Valves
  • Exhaust Valves - GSC 33mm (+1mm) Exhaust Valves
  • Springs / Retainers - GSC Single Valve Springs & Titanium Retainers
  • Guides - OEM Valve Guides
  • Valve Seals - GSC Valve Stem Seals
  • Lifters - OEM Lifter Buckets
  • Camshafts - GSC Stage 2 Billet Camshafts
  • Multi-Angle Valve Job
  • Machined Cam Lobe Clearance
  • Resurface
  • Ultrasonic Cleaning
  • Final Lash

  • Gaskets, Hardware & Accessories:
  • Head Studs - ARP 625+ 11mm Set
  • Head Gaskets - OEM
  • 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 04-13 Forester XT
    • Subaru 07-09 Legacy GT
    • Subaru 06-14 WRX



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