IAG 800 FA20 DIT Closed Deck Long Block Engine w/ IAG 800 Heads for 2015-21 Subaru WRX

The IAG Performance Hand-Built 800 Subaru FA20F (DIT) is a great choice for those looking to get more out of their modified WRX. Each Long Block Package is a complete, valve cover to valve cover, timed, crate engine. These engines offer significant ease of installation for customers seeking a complete "drop-in" engine package for their 2015+ Subaru WRX. The Long Blocks feature a combination of our proven IAG Performance Short Block and Cylinder Head packages, along with other race-proven components to complete the assembly. When paired with our Long Block Installation Packages, you have a true plug-and-play solution to get you back on the road, FAST! All components included are BRAND NEW and there is NEVER A CORE CHARGE required.

Every IAG 800 FA20 Long Block is sold complete and ready to install. Since their introduction to the WRX lineup in 2015, the FA20F has proven to be one of the more difficult Subaru engines to work on, especially for those who are inexperienced with the platform. The timing system on these engines is complicated. One wrong move can leave you needing a new set of valves. In building the IAG Long Block line we set out to make installation as easy as possible. To that end, we have decided to only offer the FA20 long blocks with all new timing components pre-installed. This means all your mechanic needs to do is swap over the manifolds, sensors, injectors, and external accessories to get you back on the road ASAP. Most installations can be completed in a day.

It's no secret that the OEM connecting rods are the weak link when it comes to the FA20F engines. Any increases in low end torque can stress the OEM rods to the point of breaking. When a rod breaks it causes catastrophic damage inside the engine, sometimes even leaving big holes in the engine case. With this in mind, all of our FA20 short blocks feature upgraded rods. The IAG 800 FA20 DIT Long Block features IAG Spec H Beam connecting rods with ARP 2000 hardware, which are a significant upgrade from the OEM components. You can feel confident when increasing your horsepower and torque that the rods are designed to handle the stress.

Each Stage 2 FA20F DIT WRX Short Block features IAG Spec JE FSR 86.1mm Forged Pistons. These 2618 T6 Alloy high-strength pistons have been specifically designed to support increased cylinder pressures which come with more boost. FSR forgings reduce mass and wear caused by friction without sacrificing strength. This is accomplished by using an asymmetrical skirt design instead of the traditional full-round skirt, also this reduces weight significantly. Featuring smooth flowing radii on the domes and dishes, the design promotes excellent flame travel. The pistons are secured to the rods with .866" x 2.250" x .230" wall 9310 nickel carbon steel wrist pins with Tru Arc locks.

Our unique closed deck system significantly increases the strength of the OEM case halves. This process supports the cylinder walls at the top of the case in order to prevent flexing and possible cracking where the case bolt reliefs are cut into the back of the cylinder wall.
During the installation process we machine the assembled case halves in our Haas VF-4SS CNC mill to accept the IAG Closed Deck inserts. Once the case has been machined we heat it in an oven while freezing the specially machined inserts with liquid nitrogen. The inserts are then pressed into place and then machined to a mirror finish. To ensure proper head gasket sealing for high boost an o-ring groove is added to the deck and a copper wire is installed.
The unique inserts feature small passages that allow needed coolant flow to the deck surface. This means that the closed deck system does not affect the block's cooling ability and will not cause overheating, even in daily drivers.

The IAG 800 FA20 WRX Head Package also features Kelford's new 272-A Camshafts, which are proven to add a significant bump in power across the rev range without sacrificing driveability. The cams are installed in the upper cam tower assembly and attached to the lower portion of the head casting. Valve lash is carefully measured and set at this time using new, OEM shims for proper clearance. New OEM valve covers are added for a complete valve cover-to-valve cover assembled long block. Once assembled, we add new OEM timing components and a Subaru FA20 timing chain cover with built-in oil pump.

Our Build Advisors and Customer Support staff can assist you with any questions or concerns about our long blocks. We are here to help you decide which IAG products best fit your performance goals and budget. Just click the button below for assistance.

We stand behind every hand-built engine we produce. IAG's Standard Long Block Workmanship Warranty covers your long 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.

Power:The IAG 800 Long Block has a power output rating of 800BHP.

The optional IAG Long Block Installation Kit provides all of the basic components needed to install one of our FA20F Long Block Engine Packages in one complete kit. This kit includes all of the gaskets and seals required to install the timed long block. The kit also includes a new water pump and thermostat, spark plugs, oil pan, pickup, and crank bolt. All fluids for initial break-in are included.

During installation your mechanic will need to swap over the external components from your engine such as the intake and exhaust manifolds, turbocharger, fuel pump, injectors, scavenge pump, etc.

When installing your new IAG FA20F Timed Long Block your mechanic will need to reinstall your injectors. If you engine experienced a previous failure we recommend replacing your fuel injectors with new OEM injectors. This kit provides a set of 4 new Subaru OEM fuel injectors which come with the direct injection seals preinstalled. The kit also includes new spring clips to secure the injectors.

If reusing your original injectors it is important to replace the injector seals during installation. Our injector seal kit includes all new seals and clips for your original injectors. (Note that a special tool is required for installation of the new seal kit and is not included)