Description

It's no secret that the OEM Subaru case halves, or "block," aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru EJ25 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary "Closed Deck" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. The IAG 950 Closed Deck Case takes the strength one step further by adding provisions for our race-proven Fire-Lock™ head gaskets system, along with modifications for 14mm head studs. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.

Specifications

What's Included

  • (x1) IAG 950 Closed Deck Converted Case Halves (Using brand new EJ25 Case / Stock Bore 99.5mm)

         *99.75mm Bore and hone additional and required before final assembly!

  • (x1) Machined for OEM 14mm Head Studs (Head Studs Sold Separately)

  • (x1) Machined for Fire-Lock™ Head Gaskets (Gaskets Sold Separately)

Compatibility

  • 2004-2013 Subaru Forester (XT)
  • 2004-2014 Subaru Impreza (WRX STI)
  • 2005-2009 Subaru Legacy (GT)
  • 2006-2014 Subaru Impreza (WRX)
  • 2007-2009 Subaru Legacy (GT spec.B)
  • 2015-2021 Subaru WRX (STI)

It's no secret that the OEM Subaru case halves, or "block," aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru EJ25 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary "Closed Deck" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. The IAG 950 Closed Deck Case takes the strength one step further by adding provisions for our race-proven Fire-Lock™ head gaskets system, along with modifications for 14mm head studs. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures.

  • (x1) IAG 950 Closed Deck Converted Case Halves (Using brand new EJ25 Case / Stock Bore 99.5mm)

         *99.75mm Bore and hone additional and required before final assembly!

  • (x1) Machined for OEM 14mm Head Studs (Head Studs Sold Separately)

  • (x1) Machined for Fire-Lock™ Head Gaskets (Gaskets Sold Separately)
  • 2004-2013 Subaru Forester (XT)
  • 2004-2014 Subaru Impreza (WRX STI)
  • 2005-2009 Subaru Legacy (GT)
  • 2006-2014 Subaru Impreza (WRX)
  • 2007-2009 Subaru Legacy (GT spec.B)
  • 2015-2021 Subaru WRX (STI)

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