Product images and videos 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.

Engines and Components› Engines, Blocks and Components

IAG Performance

1150 Closed Deck Long Block

Name: 1150 Closed Deck Long Block
Brand: IAG Performance
SKU: IAG-ENG-L115W2

$18,187.49

SKU: IAG-ENG-L115W2

Free Shipping over $200

$100 Minimum Order

Non-Returnable Item

DIY PRO SHOP

Professional / shop required

Overview

The IAG Performance 1150 Closed Deck Long Block is a complete, valve-cover-to-valve-cover crate engine designed to support high-performance applications up to 1150 BHP. This hand-built package features a new Subaru EJ25 case converted to a closed deck with 99.75mm bore and 14mm head stud machining.

Show original supplier description

The IAG Performance 1150 Closed Deck Long Block is a complete, crate-ready solution designed for high-horsepower Subaru builds targeting up to 1150 BHP. Each engine is built on a new EJ25 Subaru case that is converted to a closed deck design and honed to a 99.75mm bore, featuring 14mm head stud machining and IAG's proprietary Fire-Lock™ gasket solution to ensure maximum sealing under extreme turbocharged pressure. The internal assembly includes IAG-Spec JE FSR 2618 forged pistons with an electroless nickel plating, paired with IAG-Spec Tri-Beam connecting rods and ARP 625+ rod bolts. The rotating assembly is completed with an IAG-Spec Billet crankshaft and ARP main bolts for structural integrity. The long block comes with a 12-month or 12,000-mile workmanship warranty. Buyers can extend this to 24 months or 24,000 miles if the engine is purchased, installed, and tuned by an IAG Certified Installer. No core charge is required for this brand-new 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.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

Brand	IAG Performance
Part Number	IAG-ENG-L115W2
Category	Engines and Components

Videos

What IAG block is right for you?

IAG Performance New Engine Line up

IAG 1150 EJ25 Block

Building An IAG EJ Long Block.

IAG Performance 570HP STi Daily Driver

How to Break-In a Built Engine PROPERLY

IAG 550 Ej25 Block

WRX Gets 600hp IAG BUILT ENGINE!! | Engine Install

800+ HP HyperBlue Subaru STI | Build Breakdown

IAG 750 EJ25 Block

5,000+ Trusted brands

1M+ Enthusiasts

5M+ Parts sold

(760) 282-4645 hello@motormia.co

Buy with Confidence

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.

View Full Return Policy

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.

View Full Shipping Policy