Click on image to zoom

IAG Performance S2.5 EJ20 Short Block Stage 2.5 EJ20 Subaru Closed Deck Short Block

Engine Short Block


IAG Stage 2.5 EJ20 Subaru Closed Deck Short Block for 02-05 WRX.

  • All IAG short blocks are balanced and blueprinted.
  • Compression Ratio: 8.5:1 on D Cylinder Heads (EJ255) 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket.
  • Head Gasket Recommendations: IAG Recommends JE Pro Seal .039 inch head gasket
  • The IAG Stage 2.5 Short Block has a power output rating of 700BHP.
Pricing: $4,799.99

Free ground shipping on all order over $100.00 (some exclusions may apply)


Subaru: Impreza 02 - 05 WRX

Stage 2.5 Closed Deck Includes: Case Halves -Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 92.5mm, Pistons -IAG-Spec JE FSR 92.5mm 2618 Forged Pistons, Ring Set, .210" 9310 Steel Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins), Connecting Rods -IAG-Spec H-Beam / ARP2000 Rod Bolts, Rod / Main Bearings -ACL or King Race bearings, Crankshaft -New Subaru WRX 2.0L Crankshaft with improved oil passages, Case / Main Bolts -Standard FHI Subaru case bolts.

IAG Stage 2.5 Subaru EJ20 Closed Deck Short Block. The IAG Stage 2.5 Short Block starts with brand new Subaru 2.0L 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. Next, the short block is Deck Plate bored and honed to 92.5mm 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 Subaru 2.0L crankshaft with improved oil passages that is matched to ACL or King race main bearings. IAG-Spec H-Beam connecting rods and ARP 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 92.5mm JE FSR 2618 Forged Pistons with .210" 9310 Steel Wrist Pins are added to finish the Stage 2.5 2.0L short block.


  • IAG-ENG-1258
  • IAG-ENG-1258
  • 887753780812
  • IAG Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 105.0 lbs.
  • W19.0000” x H16.0000” x L19.0000”
  • Free ground shipping on all order over $100.00 (some exclusions may apply)

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.