Description

  • Unable to Redeem Reward Points on ALL IAG Products (If attempted to use, the order will be cancelled)
    Usually Ships in 24 to 72 Hours
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  • The IAG Trojan Short Block starts with brand new Subaru 2.5L engine case halves. IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that transform the block into a solid deck. The unique inserts feature small passages that allow needed coolant flow to the deck surface. The case halves are then CNC machined with O-ring receiver grooves around the bore surface as well as drilled and tapped to accept 1/2″ head studs that greatly reduce head gasket failure during high cylinder pressure scenarios. Next, the short block is Deck Plate bored and honed to 99.75mm in our in-house Sunnen SV-30 the most advanced automotive cylinder hone available. IAG’s in-house honing process is able to set custom piston to wall clearances to best fit your needs. The modified case halves are then assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft that is matched to ACL or King race main bearings. IAG-Spec Tuff H-Beam connecting rods and ARP 625+ rod bolts are utilized along with ACL or King race rod bearings. The case halves are sealed with new OEM main/case bolts and sealant. Finally, IAG-Spec 99.75mm JE FSR 2618 Forged Pistons and electroless nickel plated tops and ring area as well as upgraded .250″ / .906″ H13 wrist pins are added to finish the Trojan short block. Additionally, all IAG-Spec piston skirts utilize the JE Perfect Skirt coating.
    • IAG Trojan Closed Deck Includes:
      • Case Halves –Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 99.75mm.
      • O-Ringing –Machine and O-Ring Deck Surface
      • Head Studs –Machine Case to 1/2″ head studs – * Head studs are sold separately
      • 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 / 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.
  • Specs: This IAG Short Block has a power output rating of 750BHP.
  • 8.5:1 on D Cylinder Heads (EJ255)
  • 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket

*All IAG short blocks are balanced and blueprinted

Head Gasket Recommendations:

  • *IAG Recommends JE Pro Seal .039 inch head gaskets
  • JE PN# SB1001-039 are for use with S20, B25 & D25 Cylinder Head Castings (04-06 STI, 06-14 WRX, 04-13 FXT, 05-12 LGT, 02-05 WRX)
  • JE PN# SB1003-039 are for use with V25, W25 & N25 Cylinder Head Casting (2007-20 STI)