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.

 

 

ENGINEERED FOR DURABILITY

Tailored for enhanced performance in modified EJ25 Subarus demanding a more robust short block to withstand heightened cylinder pressures from increased boost, the IAG 550 Short Block stands out. Boasting IAG Spec H-Beam forged connecting rods, this short block is equipped with upgraded components, including race bearings, capable of handling the added engine load generated by larger turbochargers or elevated boost levels—requirements beyond the reliable capacity of the OEM STI rods found in Stock short blocks.

CONSTRUCTED USING 100% NEW ELEMENTS

Every IAG 550 Short Block begins with pristine EJ25 Subaru 2.5L engine case halves, boasting a standard 99.5mm stock bore. The case halves undergo meticulous measurement and assembly processes, incorporating a new 2017+ Subaru 2.5L nitride treated STI crankshaft, perfectly paired with ACL or King race main bearings. This short block is equipped with IAG Spec H-Beam Connecting Rods featuring ARP2000 rod bolts, complemented by ACL or King race rod bearings. The assembly is sealed with new OEM main case bolts and sealant. To complete the short block, IAG Spec JE 99.5mm Forged Pistons are thoughtfully chosen, measured, and expertly installed.

FORGED PISTONS, OPTIMIZED FOR BOOST

Incorporating IAG Spec JE 99.5mm Forged Pistons, each IAG 550 Short Block is equipped with high-strength pistons made from 2618 T6 Alloy. These pistons are specifically crafted to withstand increased cylinder pressures associated with higher boost levels. The design incorporates an asymmetrical skirt design, deviating from the traditional full-round skirt, resulting in a significant reduction in weight. With smooth flowing radii on the domes and dishes, this design promotes excellent flame travel. Secured to the rods with .905 x 2.250" x .180" wall carbon steel wrist pins featuring Tru Arc locks, these pistons ensure robust performance under 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.