IAG

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

2008-2021 Subaru STI

$12,749.99
Ships for free in the 48 states

SKU: IAG-ENG-4025WS2

On order from MFG
Average time to ship: 9 business days

HIGHLIGHTS:

  • Fully blueprinted, balanced, and assembled by IAG Performance
  • Designed to handle up to 900+ BHP
  • Will include GSC's Stage 2 billet camshafts

Details

IAG 900 Closed Deck Long Block Engine w/ Stage 4 Heads & GSC S3 Cams 


900 CLOSED DECK LONG BLOCK INCLUDES:

  • Case Halves: Converted to closed deck from brand new OEM Subaru case halves that are bored and honed to 99.75mm 
  • Fire Lock - IAG Fire-Lock receiver groove machining, the latest solution to prevent head gasket failure on high horsepower and high boost Subarus
  • Machined casings for 14mm head studs
  • IAG Pec JE FSR 99.75mm 2618 forged pistons, electroless nickel-plated tops and ring area, ring set, .250" / .906" H13 wrist pins and clips
  • IAG-Spec Tuff H-Beam +2mm connecting rods with ARP 625+ rod bolts
  • ACL or King Race rod and main bearings
  • Standard new Subaru nitride treated 2017+ STI crankshaft

 

STAGE 4 HEADS:

  • Brand new Subaru OEM WRX/STI cylinder head castings
  • CNC machine ported intake and exhaust runners
  • GSC 37mm (+1mm) intake valves
  • GSC 33mm (+1mm) SuperAlloy exhaust valves
  • GGSC beehive valve springs and retainers
  • GSC Manganese valve guides
  • GSC valve stem seals
  • OEM lifter buckets
  • GSC Stage 2 billet camshafts
  • Multi-angle valve job
  • Machined cam lobe clearance
  • Drilled for 14mm head studs
  • Resurfaced
  • Ultrasonix cleaning
  • Final lash

 

GASKETS AND HARDWARE:

  • IAG / ARP 14mm head studs
  • IAG Fire-Lock head gaskets
  • OEM valve cover gaskets
  • OEM cam seals
  • OEM valve covers
  • Wrist pin seal, rear main seal, and separator kit
  • Crankshaft woodruff key

 

BALANCED AND BLUEPRINTED WITH A 900 BHP RATING

For those of you with a tired EJ, or 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 900 Closed Deck Long Block 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 900 is a great option for those of you who want an engine strong enough to sustain up to 900+ HP levels. 

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