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IAG 900 Closed Deck Long Block Engine w/ Stage 4 Heads & GSC S2 Cams - Subaru Models (inc. STI 2004 - 2007)
IAG 900 Closed Deck Long Block Engine w/ Stage 4 Heads & GSC S2 Cams - Subaru Models (inc. STI 2004 - 2007)
IAG 900 Closed Deck Long Block Engine w/ Stage 4 Heads & GSC S2 Cams - Subaru Models (inc. STI 2004 - 2007)

IAG 900 Closed Deck Long Block Engine w/ Stage 4 Heads & GSC S2 Cams

Subaru Models (inc. STI 2004 - 2007)

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Part # IAG-ENG-4025VS2
$11,549.99

Product will ship from manufacturer, average time to ship: 69 business days
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Features & Product Details

RallySport Direct now carries highly sought-after high-performance upgrades and accessories brought to you by IAG Performance. 

On this page, you are looking at the IAG 900 Long Block. This package is a complete, valve cover to valve cover, crate engine. It is the perfrect option for ease of installation and gives you a premier "drop in" engine. This kit will support up to 900BHP applications. IAG's break-in instructions MUST be followed and the package must be professionally installed for the 12 month / 12k mile warranty to be applicable. All IAG Short Blocks are balanced and blueprinted.

Here is what the package contains:

IAG Magnum Closed Deck Includes:

  • Case Halves - Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 99.75mm.
  • Fire-Lock - IAG Fire-Lock receiver groove machining, latest solution to prevent head gasket failure on high horsepower and high boost Subaru's - *IAG Fire-Lock head gaskets required
  • Head Studs - Machine Case for 14mm head studs
  • Pistons - IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Electroless Nickel Plated Tops & Ring area, Ring Set, .250" / .906" H13 Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
  • Connecting Rods - IAG-Spec Tuff H-Beam +2mm / ARP 625+ 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 4 Heads:
  • Heads - Brand New Subaru OEM WRX STI Cylinder Head Castings
  • Machine Porting - CNC Ported Intake and Exhaust Runners
  • Intake Valves - GSC 37mm (+1mm) Intake Valves
  • Exhaust Valves - GSC 33mm (+1mm) SuperAlloy Exhaust Valves
  • Springs / Retainers - GSC Beehive Valve Springs & Retainers
  • Guides - GSC Maganese Valve Guides
  • Valve Seals - GSC Valve Stem Seals
  • Lifters - OEM Lifter Buckets
  • Camshafts - GSC Stage 2 or 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
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