IAG 1000 FA20 DIT Subaru Closed Deck Short Block for 2015-21 WRX - 1000 BHP
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IAG Performance
IAG 1000 FA20 DIT Subaru Closed Deck Short Block for 2015-21 WRX - 1000 BHP
- SKU:
- IAG-ENG-S1020
- UPC:
- 887753904218
- Availability:
- Usually Ships in 24 to 72 Hours
- Proposition 65:
P65 WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov.
IAG 1000 FA20 DIT Subaru Closed Deck Short Block for 2015-21 WRX - 1000 BHP
IAG 1000 FA20 DIT SUBARU CLOSED DECK SHORT BLOCK FOR 2015-21 WRX - 1000 BHP
SERIOUS POWER. REAL-WORLD DURABILITY
The IAG 1000 FA20 DIT Subaru Closed Deck Short Block is built for enthusiasts who want big power without sacrificing reliability. Designed to support up to 1000 BHP, this combination delivers the strength needed for serious boost while maintaining the durability required for real street use. Inside, you’ll find IAG-Spec H-Beam forged connecting rods paired with IAG-Spec JE pistons featuring an electroless nickel-plated coating and H13 tool steel wrist pins. The case is precision-machined to accept our proven Fire-Lock head gasket system and 14mm head studs (sold separately). Each IAG 1000 short block is hand-assembled using ACL or King rod and main bearings for consistent, reliable performance, whether you're street driving, drag racing, or out on the track.
CLOSED DECK FOR SERIOUS STRENGTH
The IAG 1000 FA20 DIT Subaru Closed Deck Short Block uses a precision-machined closed deck conversion to significantly reinforce the factory Subaru case halves. By adding structural support around the tops of the cylinder walls, the design limits cylinder wall movement and reduces the potential for cracking in high-stress areas like the case bolt reliefs. The assembled case halves are machined in our Haas VF-4SS CNC mill to accept IAG Closed Deck inserts, then the block is heated while the inserts are cryogenically cooled so they can be pressed into place for a secure mechanical fit. Once installed, the deck surface is machined to a smooth, mirror finish. Each insert is designed with built-in coolant passages so proper flow to the deck surface is maintained, meaning you get the added strength of a closed deck without sacrificing cooling performance.
BUILT WITH 100% NEW COMPONENTS
The IAG 1000 FA20 DIT Subaru Closed Deck Short Block for the 2015–2021 WRX begins with brand-new Subaru FA20F engine case halves that are precision-machined in our Haas VF-4SS CNC mill to accept IAG Closed Deck inserts, converting the factory open deck into a much stronger closed deck foundation built to handle serious cylinder pressure. Once the inserts are installed, deck plates are bolted on, and the block is bored and honed to 86.25mm using our Sunnen cylinder hone, allowing us to dial in exact piston-to-wall clearances for proper ring seal, quiet operation, and reduced oil consumption. While it’s on the mill, we machine a groove at the top of each cylinder for the Fire-Lock head gasket system and drill the head bolt holes to accept 14mm head studs. From there, the case halves are assembled with a brand-new Subaru FA20 DIT crankshaft, IAG-Spec H-Beam forged connecting rods with ARP 625+ rod bolts, and ACL or King Race rod and main bearings. Finally, every short block is balanced, blueprinted, and sealed with new OEM main and case bolts and factory sealant, delivering a rock-solid foundation built to handle up to 1000 BHP.
IAG FIRE-LOCK SYSTEM
The IAG 1000 FA20F Subaru Closed Deck Short Block features our proprietary “Fire-Lock” Head Gasket System. This system has been proven in our record-setting race cars to be the strongest Subaru head gasket system ever produced. To achieve these results, our engineers separated combustion sealing from the oil and coolant sealing functions of a traditional head gasket. Each cylinder is precision-machined with a counterbore step at the top to accept the Fire-Lock ring that mechanically locks into place and creates an extremely secure combustion seal. The independent gasket bodies handle sealing the oil and coolant passages, keeping fluids out of the combustion chamber where they don’t belong. The entire assembly is secured using 14mm head studs for maximum clamping force (Fire-Lock Gaskets and 14mm Head Studs sold separately).
PISTONS DESIGNED WITH POWER IN MIND
The pistons in the IAG 1000 FA20 DIT Subaru Closed Deck Short Block are built to handle the demands of serious performance use. Developed in partnership with JE, these IAG-Spec pistons are manufactured from 2618 alloy and feature an electroless nickel-plated coating for added durability. Extra-thick ring lands help resist collapse under high cylinder pressure, lateral gas ports to help promote piston ring seal under higher boost, while upgraded .250" wall H13 tool steel offset wrist pins are designed to support power levels up to 1000 BHP without bending or failure. Each piston also includes JE’s Perfect Skirt coating to promote smooth operation and long-term reliability.
What's Inside:
IAG 1000 FA20 DIT Subaru Closed Deck Short Block Includes:
- Case Halves - Converted to Closed Deck from brand new OEM Subaru case halves
- Case Machining - Bored and honed to 86.25mm
- Fire-Lock - IAG Fire-Lock receiver groove machining, the latest solution to prevent head gasket failure on high horsepower and high boost Subaru's - *Requires IAG Fire-Lock Head Gaskets that are sold separately Part# IAG-ENG-1755
- Head Studs - Machined for 14mm Head Studs - *Requires 14mm Head Studs that are sold separately Part# IAG-ENG-1711
- Pistons - IAG-Spec JE FSR 86.25 2618 Forged Pistons, Electroless Nickel Plated Tops & Ring area, Ring Set, .250" H13 tool steel wrist pins, Clips, (Perfect Skirt Coating and Offset Wrist Pins).
- Connecting Rods - IAG-Spec H-Beam Connecting Rods with ARP 625+ rod bolts
- Rod - ACL or King Race
- Main Bearings - ACL or King Race Bearings
- Crankshaft - New Subaru FHI FA20 Crankshaft
- Case / Main Bolts - Standard FHI Subaru case bolt
Compression Ratio:
- 10:1 compression
Power Rating:
Power: The IAG 1000 Short Block has a power output rating of 1000 BHP
Hardware / Seal Option:
Not planning on reusing your original short block oil plugs? IAG offers a simple comprehensive cover and seal kit that includes (1) Rear main seal and (3) OEM Oil Plugs.
* Never reuse a rear main seal on a new short block.
* Please note all IAG FA20 DIT Short Blocks come with the oil pan side plug preinstalled. This kit does not include that plug.
Head Gasket Option:
After years of research and development testing, the IAG Performance Fire-Lock head gasket is the newest solution to preventing head gasket failure on high horsepower and high boost Subaru FA20 engines. This solution is loosely derived from diesel technology, where a counterbore step is machined around each cylinder bore, allowing specially sized fire rings to drop into the machined area and head gasket bores. The shims are designed to create a compression seal once the heads are installed and torqued into place. IAG fire rings are manufactured to a very strict tolerance from a proprietary alloy and are then put through a heat treatment process. The gaskets are manufactured from an asbestos-free composite raw material and feature a silicone-based beading applied to critical areas to improve sealing around all water and oil passages. The combination of the alloy compression shims and gaskets assures maximum sealing for a Subaru FA20 turbocharged engine.
The IAG Fire-Lock gaskets require machine work for installation and are recommended for use with 14mm head stud hardware.
The gaskets are sold in pairs with four Fire-Lock rings.
Features:
- Composite Material
- IAG-Spec Alloy Ring
- Specifically designed for 14mm Head Studs
- Silicone Beading
- 86.5mm Max Bore Size
- .051" Thickness
- Intended for High Horsepower, High Boost applications
- IAG ARP 14mm Head Studs Required
- Gaskets are sold in pairs
Oil Pickup:
Oil pickups are a critical failure point in the FA20F engines, especially when pushing your Subaru to its limits. The factory pickup can lead to severe engine damage or catastrophic failure due to the screen dislodging under high oil pressure, allowing debris and even fragments of the screen itself to enter the engine. Subaru’s design is also notorious for restricting oil flow, creating the potential for oil starvation. The IAG Performance Oil Pickup for the 2015-2021 FA20F WRX is designed to solve these issues. With an enhanced design that improves oil flow and durability, it offers a dependable solution to the common problems with OEM oil pickups. IAG’s Oil Pickup will keep your engine performing at its best, no matter how hard you drive.
We’re confident that the IAG Performance Oil Pickups are the best available on the market, and we’ve got the data to prove it. We’ve rigorously tested our pickups and compared them against the OEM Subaru pickup, along with some of the most popular competitive products available. Click here to see the comprehensive test results and find out why IAG Performance stands out from the competition.
Instructions & Install Notes:
1. If a block or cylinder head was previously O-ringed the groove must be filled and resurfaced before using this type of gasket.
2. These gaskets require IAG ARP 14mm head studs to achieve the required torque necessary for proper installation.
3. Due to the required torque, any block that was previously honed will need to go to the next size overbore.
4. Future servicing will require cylinder head resurfacing due to an imprint left from the Fire-Lock rings.
IAG-ENG-1711 - IAG 14mm Head Stud Closed Deck Install Guide - PDF Instructions
Need Help Choosing a Block?
Our Experts Are Here to Help
We made this video to highlight the differences between each of our short blocks and to help you choose the best one for your performance goals and budget. Our Build Advisors and Customer Support staff can also assist you with any questions or concerns. Just click the button below for assistance.
Quality Guaranteed
Available 24 Month/24,000 Mile Warranty*
We stand behind every hand-built engine we produce. IAG's Standard Short Block Workmanship Warranty covers your short block for 12 months or 12,000 miles. We have also teamed up with a selection of IAG Certified Installation Facilities which offer up to a 24 month/24,000 mile workmanship warranty when the engine is purchased, installed, and tuned by that IAG Certified Installer.
Model Year & Fitment
- 2015 Subaru WRX
- 2016 Subaru WRX
- 2017 Subaru WRX
- 2018 Subaru WRX
- 2019 Subaru WRX
- 2020 Subaru WRX
- 2021 Subaru WRX
SHIPPING
FREE SHIPPING on orders of $250 or more* Simply look for the logo to enjoy free shipping on selected items throughout the store. Oversized packages and freight shipments do not qualify for free shipping. If the items in your order which qualify for 'Free Shipping' total $250 or more, your order ships FREE! Free shipping is only available to the continental United States also referred to as the “lower 48 states”.Shipping Policy: All products sold on the shopping cart are shipped by UPS or USPS. All packages include shipping insurance in case they are lost or damaged. USPS requires signature confirmation on all insured orders over $200.00. USPS shipping times are estimated and not guaranteed. UPS tracking numbers are automatically generated when a package ships and the number is sent to the email address you provided. If a package contents is damaged during shipping please notify the shipping driver and file a claim with the shipper. You have 14 days to inspect your shipment and contents. After that period of time, IAG is no longer responsible for missing items. You have 30 days to report any damaged or incorrect items, after that period of time IAG is no longer responsible for returns or exchanges. You can contact us by Email or call 410-840-3555 for assistance. *International orders are subject to customs charges, duties or fees. Please check with your local customs office before ordering. IAG is not responsible for international customs charges, duties or brokerage fees.
Drop Shipping: Some items require drop shipping to complete an order. These products are shipped from manufacturer or distributor warehouses across the country. In some cases, this may speed up delivery time. In other cases, it could add 1-3 days to the delivery time. If you have a question regarding an order please contact our sales desk at 410-840-3555.
Order Processing: Orders placed after 3PM EST may not be processed the same day. Order processing may take 24-48 hours. USPS orders placed after 10am EST will ship the following business day if the items are in stock
RETURNS
How do I return an item?
You have 14 days to inspect your shipment and contents. After that period, IAG is no longer responsible for missing items. You have 30 days to report any damaged or incorrect items, after that period IAG is no longer responsible for returns or exchanges. All stocking products are subject to a 30 Day return policy. The item(s), when approved for return, are subject to a 20 percent restocking fee. Canceled orders may be subject to a 20 percent cancellation fee. All product returns require a return authorization number before being shipped back to IAG or the manufacturer. An “RMA” number is obtained by calling the IAG Support Desk at 410-840-3555 or emailing support@iagperformance.com. Some products may require shipping back to the manufacturer for inspection before a return or exchange may be processed. Some products may not be able to be returned. Products that have been modified or installed are not eligible for return. There are no returns or cancellations for Special Order/Made to Order items and Electrical Components (including the COBB Accessport). Items returned after the 30 Day return period without an RMA will be refused. Canceled service appointments with deposits are non-refundable.
Refunds take 30 days or less. Payments made by Credit Card or PayPal are returned back to the original account used during the transaction. There are no cash returns; we will issue a business check for the return of funds. Refunds are decided by the management and not by sales staff. Canceled service appointments with deposits are non-refundable.
IAG Performance Product Warranty (Excluding - Short Blocks / Long Blocks)
This limited warranty gives you specific legal rights and you may also have other rights, which vary from state to state. We limit the duration and remedies of all implied warranties, including, without limitation, the warranties of merchantability and fitness for a particular purpose to the duration of this express limited warranty. Some states do not allow limitations on how long an implied warranty lasts. The remedies described below are your sole and exclusive remedies and our entire liability for any breach of this limited warranty. Our liability shall under no circumstances exceed the actual amount paid by you for the product, nor shall we under any circumstances be liable for any consequential, incidental, special or punitive damages or losses, whether direct or indirect.
This warranty covers defects in materials and workmanship of your IAG Performance Product for 12 Months or 12,000 Miles from the date of receipt.
IAG will repair any IAG Manufactured Product that proves to be defective in materials or workmanship within the warranty period. If a repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection but the buyer is responsible for shipping charges.
IAG Performance Engine Warranty
For more information concerning our engine warranty please visit IAG Performance Engine Warranty Page
Other Manufacturer Products:
Products not manufactured by IAG are subject to the individual manufacturer warranties which may apply. If you have questions concerning the fitment, appearance, or performance of your item, please contact a member of our customer support team for assistance.
Our customer service team is happy to assist you with the products purchased from IAG Performance. Our support associates can help you with installation support, troubleshooting advice, and help to identify possible manufacturer defects.
For products that are found to have defects, our support department can provide the contact information for the manufacturer to arrange a warranty inspection and, if applicable, any necessary repairs or replacement shipments.
You may also contact the manufacturer directly for information regarding product eligibility and specific terms and conditions of warranty coverage.