IAG 750 EJ25 Built Closed Deck Subaru Short Block – Subaru

$6,801.02

IAG Wrist Pin & Cover Seal Kit for Subaru EJ20 / EJ25 Short Blocks

ARP Head Stud Kit - 11mm Cylinder - EJ20 & EJ25 Engines

IAG Stage 2 CNC Ported 11mm Oil Pump - Subaru EJ25

Fluidampr Harmonic Balancer - Subaru EJ Motor

Subaru Block Heater - All Turbo EJ Engines

Cusco Clear Timing Cover - 2004-2021 Subaru STi

RCM Clear Timing Belt Cover – 2002-2007 Subaru WRX & STi - Single AVCS

RCM Clear Timing Belt Cover – 2008-2021 Subaru WRX STi - Dual AVCS

Subaru OEM Oil Filter 15208AA100 - Subaru EJ

NOTE: Replacement for the 15208AA12A filter.

Subaru OEM Oil Drain Plug Crush Washer - Most Subaru EJ's

Motul Classic 10W40 Break-In Motor Oil - 1QT

Documents

Installation Instructions & Videos

SKU: IAG-ENG-S750 Category: Tags: , , , , Brand:

IAG 750 EJ25 2.5L SUBARU SHORT BLOCK

IAG H Beam Rods

THE PROBLEM SOLVER

The IAG 750 Short Block is designed to solve the majority of common problems which plague modified EJ25 engines, especially at higher horsepower levels. The IAG 750 short block builds off our IAG 550 block’s strengths by adding our proprietary closed deck system. This system strengthens and supports the cylinder walls to prevent cracks which can occur with increased cylinder pressures. (This is the most common issue when increasing horsepower.) The IAG 750 also features 99.75mm JE Forged Pistons and IAG Spec H beam connecting rods, along with ACL or King Race bearings. These components also significantly strengthen the common failure points such as cracked ring lands and spun bearings.

BUILT WITH 100% NEW COMPONENTS

The IAG 750 Short Block starts with brand new Subaru 2.5L engine case halves. Our machinists machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts, transforming the block into a solid deck. Next, a deck pair of deck plates are attached and the short block is bored and honed to 99.75mm in our in-house Sunnen SV-30 computer controlled cylinder hone. IAG’s in-house honing process allows us to set custom piston to wall clearances to ensure quiet operation and reduced oil consumption. The modified case halves are then assembled using a new 2017+ Subaru 2.5L nitride treated STI crankshaft and IAG-Spec Tuff H-Beam connecting rods with ARP rod bolts. IAG Short blocks feature ACL or King Race rod and main bearings and are all balanced and blueprinted. Finally, the case halves are sealed with new OEM main/case bolts and sealant.

EJ25 STI Crankshaft
IAG 750 Closed Deck Block

CLOSED DECK FOR EXTRA STRENGTH

Our unique closed deck system significantly increases the strength of the OEM case halves. This process supports the cylinder walls at the top of the case in order to prevent flexing and possible cracking where the case bolt reliefs are cut into the back of the cylinder wall.
During the installation process we machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts. Once the case has been machined we heat it in an oven while freezing the specially machined inserts with liquid nitrogen. The inserts are then pressed into place and then machined to a mirror finish.
The unique inserts feature small passages that allow needed coolant flow to the deck surface. This means that the closed deck system does not affect the block’s cooling ability and will not cause overheating, even in daily drivers.

FORGED PISTONS, DESIGNED FOR BOOST

Each IAG 750 Short Block features IAG Spec JE FSR 99.75mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. FSR forgings reduce mass and wear caused by friction without sacrificing strength. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .905 x 2.250″ x .210″ wall 9310 steel wrist pins with Tru Arc locks. The thicker steel wrist pins support additional power over the standard .180″ pins.

IAG 750 Pistons and Rings

IAG 750 Closed Deck Includes:

  • Case Halves –Converted to Closed Deck using brand new Subaru OEM case halves, bored and honed to 99.75mm.
  • Pistons –IAG-Spec JE FSR 99.75mm 2618 Forged Pistons, Ring Set, .210″ 9310 Steel Wrist Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins)
  • Connecting Rods –IAG-Spec Tuff H-Beam / ARP2000 Rod Bolts.
  • Rod / Main Bearings –ACL or King Race bearings.
  • Crankshaft –Standard New Subaru Nitride Treated 2017+ STI Crankshaft.
  • Case / Main Bolts –Standard FHI Subaru case bolts.

Compression Ratio:

  • 8.5:1 on D Cylinder Heads (EJ255)
  • 8.2:1 on B, V and W EJ257 Heads with standard thickness gasket.

Power Rating:

  • The IAG 750 Short Block has a power output rating of 750 BHP

Additional information

Weight60.00 kg
Dimensions50.00 × 50.00 × 45.00 cm

Reviews

There are no reviews yet.

Be the first to review “IAG 750 EJ25 Built Closed Deck Subaru Short Block – Subaru”

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Applications

Models suitable for this product

MakeModelYearSubmodel
MakeModelYearSubmodel
SubaruBaja2004 - 2006XT - 2.5L Turbo AWD
SubaruForester2004 - 20132.5XT
SubaruImpreza2004 - 2014WRX STi
SubaruImpreza2006 - 2014WRX
SubaruLegacy2005 - 20122.5GT
SubaruLegacy2006 - 2009Spec B.
SubaruOutback2005 - 20092.5XT
SubaruWRX2006 - 2014
SubaruWRX STi2004 - 2021

Got something to discuss?


Customer
layed.low.cav
5 years 4 months ago

what size oil pump should you be running

Support
5 years 3 months ago

This depends on a few factors but in most cases an 11mm is the recommended pump.

Customer
Subarubuilds96
4 years 6 months ago

What size head bolts would be required with this block?

Support
4 years 6 months ago

This block uses the OEM 11mm stud size.

Customer
Subarubuilds96
4 years 6 months ago

Recommended headgasket?