EJ25 - Pro Mod, Sleeved Case Halves (Provide your own)

EJ25 - Pro Mod, Sleeved Case Halves (Provide your own)

Made to Order

Expected Lead Time: Feb 2026

$1,999.99 CAD
$1,999.99 CAD
Shipping calculated at checkout.
Bore Size

CJM-ENG-E25-03-201-975
950 BHP

CJM Pro Mod - SLEEVED EJ25 

The Ultimate Subaru EJ25 Foundation for Extreme Power

Built for serious horsepower and boost, the CJM Pro Mod Sleeved EJ25 Block is a large strength improvement over the standard closed deck conversion.

Each unit begins with a brand-new OEM EJ25 case that’s CNC-machined for sleeves. Strength comes from our high Strength Ductile Iron Liners, which replace the factory aluminum bores with ultra-strong, heat-resistant sleeves.

Ductile-iron Sleeves provide significantly higher strength and durability than the OEM cast-in liners, offering exceptional wear resistance, thermal stability, and bore rigidity. The enhanced material properties allow the block to tolerate extreme cylinder pressures and boost levels, confidently supporting 950+ horsepower.

Key Features

  • CJM Ductile Iron Liners: Handle extreme cylinder pressures and heat for maximum reliability and longevity.
  • Precision Fitment: CNC machining and thermal press-fit process ensure perfect alignment and structural integrity.
  • Bore & Hone Ready: Machined for 99.50 mm pistons, with optional CJM Bore & Hone Service available.

Engineered Without Compromise

Whether for a high-boost street car or a full race build, CJM Pro Mod Sleeved EJ25 delivers the strength, cooling, and precision your Subaru engine needs to push beyond its limits.

Built Stronger. Handles More Power.

Requires:

  • CJM x P1 Mfg 14mm Head Studs
  • CJM Fire Ring Head Gaskets

Additional Upgrades available:

  • Pinned Mains
  • Upgraded CJM Pro Mod Piston Ring Pack (For Race Gas and Ethanol) **NOT FOR STREET USE**

Build Overview

BHP Capability

950

Installed Piston

 -

Connecting Rods

 -

Crankshaft

 -

Combustion Gas Seal

 -

Vehicle Compatibility

Make Model & Generation
Subaru STI 2004-2005
Subaru STI 2006-2007
Subaru STI 2008-2010
Subaru STI 2011-2014
Subaru STI 2015-2017
Subaru STI 2018-2021
Subaru WRX 2002-2003
Subaru WRX 2004-2005
Subaru WRX 2006-2007
Subaru WRX 2008-2010
Subaru WRX 2011-2014
Subaru WRX 2015-2017
Subaru WRX 2018-2021
Subaru WRX 2022-2025
Subaru Impreza 1992-2000
Subaru Impreza 2001-2002
Subaru Impreza 2003-2005
Subaru Impreza 2006-2007
Subaru Impreza 2008-2013
Subaru Impreza 2014+
Subaru Forester 1996-2002
Subaru Forester 2003-2005
Subaru Forester 2006-2007
Subaru Forester 2008-2013
Subaru Legacy 1992-2003
Subaru Legacy 2003-2009
Subaru Legacy 2009-2014
EJ25 - Pro Mod, Sleeved Case Halves (Provide your own)

$1,999.99 CAD

Features of the CJM Closed Deck Block

Precision Machined Closed Deck Inserts and Case Halves

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Draw attention to the care and craftsmanship that went into its design and development, setting it apart in terms of quality and attention to detail.

CJM Components gold anodized closed deck insert for EJ25

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Integral Cooling Jacket

Achieve superior engine cooling with our advanced CJM closed deck insert, designed with a radial cooling jacket and coolant pass thru holes.