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02-07 WRX & STI Subaru EJ257 STi 2.5 Liter Shortblock

This is a genuine Subaru EJ257 2.5 liter shortblock. This shortblock is standard equipment on the 2004+ US Market STI. The 2.5 liter block makes a great upgrade for all WRX models, since there is no replacement for displacement. The US STI block features a semi-closed deck for increased strength. This motor is physically a bolt-in for all US-market WRX and STi models (WRX's will require ECU tuning, bigger injectors, etc.). The 2.5L short blocks are build date specific. You will need to check your drive side door jam to determine which part number is needed to properly mate up to the heads.


  • Notes:
  • THIS IS NOT A COMPLETE MOTOR: This is a fully assembled bottom end, which consists of a block, crank, rods and pistons only. You will need to reuse your stock cylinder heads or purchase replacements.
  • The OEM 2.0L WRX heads will bolt-on for to the 06/2006 & before 2.5L short block, but there will be a bump in compression.
  • For high-powered applications, we recommend replacing the cast OEM pistons in this block with CP Forged OEM-size units.
  • For shipping outside of the continental US, give us a call.
  • FITMENT:
  • Subaru STI 2004-2007
  • Subaru WRX 2002-2007
Description Part # MSRP Price Inventory  
Subaru OEM STI Shortblock 10103AC030 $2,921.51 $2,568.49 2 available
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©2014 JSC Speed Inc.
All Rights Reserved.

510 Hyde Park
Doylestown, PA
18902

Tel: 215.489.2820
Fax: 215.489.2826