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IAG

Stage 2 FA20 DIT 86.1mm Short Block

$5,249.99 $5,249.90 Save $0.09

SKU: IAG-ENG-S600

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Special Order
Ships in 4–6 weeks
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$100 Minimum Order
30 Days Return
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Overview

The IAG Performance Stage 2 FA20 DIT Subaru Short Block is a robust engine component designed for the 2015-2021 Subaru WRX.

This short block features brand new OEM Subaru FA20 case halves that are bored and honed to 86.1mm for tighter piston-to-wall clearances and a quieter engine. It includes a new Subaru FA20 DIT WRX crankshaft, IAG-Spec H-Beam rods with ARP2000 rod bolts, and IAG-Spec 86.1mm forged pistons. The assembly achieves a 10.6:1 compression ratio with standard gasket thickness, aiming to significantly increase power output and improve reliability over OEM.

It is compatible with 2015-2021 Subaru WRX models.
Show original supplier description
The IAG Stage 2 FA20 DIT Subaru Short Block is engineered to provide a stronger bottom end for stock or modified Subaru WRXs, enabling support for increased cylinder pressures from higher boost levels. This performance short block utilizes IAG-Spec H-Beam forged connecting rods with ARP2000 rod bolts and ACL or King XPG race bearings, which are capable of handling greater engine loads than the factory components. Construction begins with brand new OEM Subaru FA20 DIT engine case halves, bored and honed to 86.1mm using an in-house Sunnen SV-30 hone for precise piston-to-wall clearances, resulting in a quieter engine. A new Subaru FA20 DIT WRX crankshaft is carefully measured and paired with King XPG main bearings. The case halves are sealed with new OEM main case bolts and sealant. The assembly is completed with IAG-Spec 86.1mm forged pistons, a ring set, .150" x 2.250" Chromoly wrist pins, and an OEM oil plug pre-installed at the oil pan location. This short block offers a 10.6:1 compression ratio with standard gasket thickness and is designed to significantly increase power output and improve reliability over the OEM engine. It is specifically designed for the 2015-2021 Subaru WRX models.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

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Specifications

BrandIAG
Part NumberIAG-ENG-S600
CategoryEngines and Components
5,000+ Trusted brands
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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