Engines and Components› Engines, Blocks and Components

IAG

750 EJ20 Closed Deck Case

$2,699.99

SKU: IAG-ENG-C755

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Overview

The IAG Performance 750 EJ20 Closed Deck Case is a performance engine component designed for enhanced durability. This closed deck case features 11mm head stud machining for increased strength. It is a direct replacement for Subaru WRX, STI, FXT, and LGT models equipped with the EJ20 engine.
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The IAG 750 EJ20 Closed Deck Case is a high-performance engine block designed to provide a robust foundation for modified Subaru WRX, STI, Forester XT, and Legacy GT vehicles equipped with the EJ20 engine. This case features a closed-deck construction, which significantly enhances its strength and ability to withstand higher boost pressures and increased power output compared to an open-deck design. Engineered for demanding applications, this case is compatible with 11mm head studs, ensuring a secure and reliable seal between the cylinder heads and the block under extreme operating conditions. The product is supplied in a 'no bore and hone' state, which is a critical specification for builders aiming for precise engine assembly. This allows a qualified machine shop to hone the cylinders to the exact tolerances required for the chosen pistons and intended performance level, optimizing ring seal and engine longevity. This IAG 750 EJ20 Closed Deck Case is designed for specific Subaru models, including the WRX (typically 2002-2005 or 2005-2014 depending on source), STI (typically 2004-2021), Forester XT, and Legacy GT, all powered by the EJ20 engine. Builders should verify precise model year compatibility to ensure a direct fit. The product is typically sold as case halves and requires professional machining and assembly.

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-C755
CategoryEngines and Components
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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.

Free shipping over $200 in the continental US. Alaska, Hawaii, U.S. territories (Puerto Rico, U.S. Virgin Islands, Guam, American Samoa, and the Northern Mariana Islands), and international orders carry surcharges — most appear at checkout. Some exceptions (LTL freight, or suppliers who quote freight only after we place the order) won’t. In those cases we’ll reach out with the exact charge before your order moves forward.

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