IAG 600 Long Block Engine w/ Stage 2 D25 Heads

2006-2014 Subaru WRX

Ships for free in the 48 states

SKU: IAG-ENG-4010DWe price match!

On order from MFG
Average time to ship: 94 business days


  • Fully blueprinted, balanced, and assembled by IAG Performance
  • Designed to handle up to 600 BHP
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IAG 600 Long Block Engine w/ Stage 2 D25 Heads 


  • Case Halves - Brand new Subaru OEM case halves, bored and honed to 99.75mm
  • Pistons - IAG-Spec JE 99.75mm Forged Pistons, Ring Set, .210" 9310 Steel Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
  • 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



  • Heads - Brand New Subaru OEM WRX STI Cylinder Head Castings
  • Machine Porting - CNC Pocket Ported
  • Intake Valves - GSC 36mm (Standard) Intake Valves
  • Exhaust Valves - GSC 32mm (Standard) 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 CleaninH
  • Final lash



  • Head Studs - ARP 2000 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



For those of you with a tired EJ, or have an EJ with large holes in the block that shouldn't be there, you're in luck. This particular short block has been built and assembled by one of the most established names in the Subaru performance industry, IAG Performance. This is the IAG 600 Long Block Engine w/ Stage 2 D25 Heads that has been blueprinted, balanced, and assembled to be ready to install in your Subaru. For those of you with modifications that make more horsepower and more boost, you may be surpassing the limits of the factory short block, and the IAG 600 is a great option for those of you who want an engine strong enough to sustain up to 600 HP levels. 

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