IAG Stage X EJ25 Billet Aluminum Short Block

Using the same world-leading technology found in Willalls 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. 
The IAG / Willall Stage X Short Block has a power output rating of 1100+BHP.

BUILD TIME ON ALL BLOCKS IS 6-8 WEEKS.

Superceded from Part #: IAG-ENG-1610

Weight
125.00 lbs
SKU
IAG-ENG-1611
Weight
125.00 lbs
Our Price: Special Price $14,999.99 Our Price: Regular Price $15,749.99

Using the same world-leading technology found in Willalls 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 Shortblock 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 / Note the proper head gaskets or head gasket modifications are required for proper fitment with 14mm studs.
  • Pistons “ IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Electro-nickel Plated Tops & Ring area, Ring Set, .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 - $550
  • Oil Pumps - Subaru JDM 12mm Oil Pump - $219 / OEM Subaru 11mm Oil Pump - $199.95
  • Hardware / Seal Option - $105.99 (Includes: Wrist pin plugs, washers, separator cover, bolts, etc. In case you dont 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.


The IAG / Willall Stage X Short Block has a power output rating of 1100+BHP.
*All IAG short blocks are balanced and blueprinted. 

BUILD TIME ON ALL BLOCKS IS 6-8 WEEKS.

Superceded from Part #: IAG-ENG-1610



warning_symbolWARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.

Weight
125.00 lbs
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