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IAG Performance / Willall Stage X 2.5L Subaru Billet Aluminum Short Block For WRX | STI | LGT | FXT


IAG Performance / Willall Stage X 2.5L Subaru Billet Aluminum Short Block For WRX | STI | LGT | FXT

  • Weight: 0 lb
  • Dimensions: N/A
  • Installation Difficulty:
SKU: IAG-ENG-1611 Categories: , ,


IAG / Willall Stage X Billet Aluminum EJ25 Subaru Short Block Using the same world-leading technology found in Willall?s incredible billet GT-R block the billet EJ case seeks to change the Subaru performance tuning market by reinventing the EJ and addressing virtually every weakness that exists in max-power builds. The Stage ?X? Block is a complete short block built on the Willall billet platform which also includes pistons rods bearings crank bore/hone case bolts line hone and final assembly and blueprinting. Stage X Billet EJ25 Case Features: Machined from solid billet 6061-T6 Aerospace grade aluminum Darton Ductile iron sleeves Increased material thickness in all known weak points (around head studs bottom end location) Unique 4 bolt bottom end strengthening Threads are rolled into the block rather than conventionally cut for much greater strength Full cooling system operation Radiused coolant and oil galleries for improved flow and less foaming/turbulence Fits all factory engine bay ancillaries (i.e. AC/PS/etc.) Multiple Times stiffer and stronger than the stock case Precision machined for a superior surface finish Hard anodized to avoid marking or straining IAG Stage X Complete Short Block Includes: Case – WREJBB Billet / Sleeved Case Halves 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 Machining – Machined for 14mm Head Studs *(Studs sold separately) Pistons ? IAG-Spec JE FSR 99.75mm 2618 Forged Pistons Electro-nickel Plated Tops & Ring area Ringset .250″ / .927″ H13 Wrist Pins Clips (Perfect Skirt Coating and Offset Wrist Pins) Connecting Rods ? IAG-Spec 2mm Tri-Beam w/ ARP625 Rod Bolts Rod/Main Bearings ? ACL/King Race Bearings Crankshaft ? Manley Billet Crank Case / Main Bolts ? ARP Main Bolts Additional Options Available: Head Studs – IAG / ARP Spec 14mm head studs nuts and washers Oil Pumps – Subaru JDM 12mm Oil Pump or OEM Subaru 11mm Oil Pump Hardware / Seal Option – (PN# IAG-ENG-1720) Includes Wrist pin plugs washers separator cover bolts etc. In case you don?t want to transfer from the original engine. Required: *IAG Fire-Lock .051″ Head Gaskets with IAG-Spec Alloy Ring Set* (PN# IAG-ENG-1740) 14mm Head Studs Compression Ratio: 8.5:1 on D Cylinder Heads (EJ255) 8.2:1 on B V and W EJ257 Heads with standard thickness gasket. Power: The IAG / Willall Stage X Short Block has a power output rating of 1100 BHP. *All IAG short blocks are balanced and blueprinted.

Make Model Submodel Year
Subaru Forester XT 2004 - 2013
Subaru Impreza WRX 2002 - 2014
Subaru Impreza WRX STI 2004 - 2014
Subaru Legacy GT 2005 - 2009
Subaru WRX STI 2015 - 2018
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