IAG Performance 550 Short Block Includes: Case Halves - Subaru Models (Inc. 2002-2014 Subaru WRX / 2004-2021 STI / 2004-2013 Forester)

Please Note: This item is not eligible for standard ground shipping and must be delivered via freight. To receive a custom invoice that includes all applicable freight charges, kindly contact us by email or phone.

 

 

CRAFTED FOR RESILIENCE

Specifically designed to meet the demands of modified EJ25 Subarus seeking increased strength in the short block to endure elevated cylinder pressures from added boost, the IAG 550 Short Block excels in performance. Featuring IAG Spec H-Beam forged connecting rods, this short block incorporates enhanced elements, such as race bearings, adept at accommodating the heightened engine load resulting from larger turbochargers or heightened boost levels—demands that surpass the reliable capabilities of the OEM STI rods found in standard short blocks.

 

 

ASSEMBLED USING 100% FRESH COMPONENTS

The IAG 550 Short Block commences with entirely new EJ25 Subaru 2.5L engine case halves, maintaining a standard 99.5mm stock bore. These case halves undergo precise measurement and assembly procedures, incorporating a newly introduced 2017+ Subaru 2.5L nitride-treated STI crankshaft, meticulously matched with ACL or King race main bearings. Featuring IAG Spec H-Beam Connecting Rods with ARP2000 rod bolts, accompanied by ACL or King race rod bearings, this short block is meticulously sealed with new OEM main case bolts and sealant. Bringing the assembly to completion, IAG Spec JE 99.5mm Forged Pistons are thoughtfully selected, measured, and expertly installed.

FORGED PISTONS TAILORED FOR BOOST

The IAG 550 Short Block stands out with its inclusion of IAG Spec JE 99.5mm Forged Pistons. Crafted from 2618 T6 Alloy, these high-strength pistons are purposefully designed to endure heightened cylinder pressures associated with increased boost. The unique asymmetrical skirt design, departing from the conventional full-round skirt, not only provides strength but also significantly reduces weight. Featuring smooth-flowing radii on the domes and dishes, this design enhances flame travel. The connection between pistons and rods is secured by .905 x 2.250" x .180" wall carbon steel wrist pins equipped with Tru Arc locks, ensuring reliable performance in boosted conditions.

IAG 550 Short Block Includes:

• Case Halves -Brand new Subaru OEM case halves 99.5mm stock bore
• Pistons -IAG-Spec JE 99.5mm Forged Pistons, Ring Set, .180" Chromoly Pins, Clips, (Perfect Skirt Coating and Offset Wrist Pin)
• Connecting Rods -IAG-Spec H-Beam Rods with 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 bolt

Compression Ratio:

• 9.3:1 on D Cylinder Heads (EJ255) w/ OEM Head Gasket
• 8.8:1 on B, V, and W EJ257 Heads w/ OEM Head Gasket
• 9.4:1 on S20 Cylinder Heads without Combustion Mod and with OEM Head Gasket
• 9.0:1 on D Cylinder Heads (EJ255) w/ .039" JE Proseal Head Gasket
• 8.5:1 on B, V, and W EJ257 Heads w/ .039" JE Proseal Head Gasket
• 9.1:1 on S20 Cylinder Heads without Combustion Mod and with .039" JE Proseal Head Gasket

 

IMPORTANT DELIVERY NOTE:

Your order is shipping Via Truck Freight which requires you to be available at the time of receipt. There is a possibility the trucking company will try to schedule a delivery time with you.

At the time of delivery, the driver will hand you the delivery receipt also referred to as the bill of lading, you will use this to notate any damages to the shipment. It is important that you fully inspect the shipment from all sides and notate any dents, punctures or rips in the outside packaging on the delivery receipt. Once you've inspected your shipment from the outside, you will need to open it and check the product in its entirety for damages and notate them if any.

If there is no damage sign for the package and enjoy!

In the rare case, you do find that your order arrived with damages, it is important you follow these steps.

- Do not refuse the product
- Document the damages in as much detail as possible on the Bill of Lading
- Take numerous photos from all angles (including packaging)
- Keep the product and contact the shipping company to start the damage claim
- Contact us either by phone or email for the next steps

In the situation where the delivery driver is unable to wait for you to open and inspect your product, simply document "driver was unable to wait for inspection." All damage must be noted on the Bill of Lading before signing and initiating a damage claim. If the damage is not notated before signing for the item it is assumed to be in good condition. This will forfeit the ability for a shipping claim and you will not be eligible for refund or replacement.