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Liquidation Sale Iag 750 Ej25 Closed Deck Case - W/ Bore & Hone / 11mm H.s.m. For Subaru Wrx Sti Fxt & Lgt Massive 55% Savings [2BGeEfji]

$117.99 $377.99 -69%

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 in

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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. 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. The IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM EJ25 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins.
  • Using brand new EJ25 Case / Stock Bore 99.5mm
  • Power: The IAG 750 Closed Deck Case has a power output rating of 750 BHP
Vehicle Specific
  • Subaru: Forester 2004 - 2015 Subaru: Impreza 2002 - 2013 Subaru: Legacy 2002 - 2013 Subaru: WRX 2012 - 2021 Subaru: WRX STI 2013 - 2021

Attributes:

  • Brand Name: IAG Performance
  • GTIN: 00887753903938
  • Cylinder Bore Diameter: 99.75
  • Cylinder Wall Configuration: Siamesed
  • Fuel Type: All
  • Grade Type: Performance
  • Hardware Included: Yes
  • Length: 21
  • Material: Aluminum
  • Piston Bore Sleeve Material: Iron
  • Power Rating: 750 BHP
  • Standard Or Reverse Rotation: Standard
  • Width: 17

Extended Information:

  • Country of Origin: US
  • Emissions : 4
  • Life Cycle Status: Available To Order

Packing Information:

  • Quantity of Each: 1
  • Package UOM: EA
  • Dimension: 19 x 19 x 16 inches
  • Weight: 65 POUNDS

PDF:

What Our Customers Say

December 31, 2025

Absolutely no complaints!

Brilliant design, excellent performance.

- Sadie Z..

December 31, 2025

Absolutely no complaints!

Excellent item, great quality.

- Traci H..

December 31, 2025

Absolutely no complaints!

Shipped fast and works great.

- Aubrey M..

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