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IAG : 800 Stage 2 Timed Long Block Engine w/Competition Heads - Subaru WRX VA 15-21 (FA20)

IAG : 800 Stage 2 Timed Long Block Engine w/Competition Heads - Subaru WRX VA 15-21 (FA20)

Regular price $31,199.95 AUD
Regular price Sale price $31,199.95 AUD
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The IAG 800 Long Block has a power output rating of 800BHP.


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.


The IAG 800 Long Block Package is ideal for clients looking for an engine to support up to 800 BHP applications. The IAG 800 FA20F (DIT) long block features our highly popular IAG 800 FA20F (DIT) WRX Short Block.

The IAG 800 short block starts with new Subaru FA 2.0L engine case halves that are machined for improved oiling. Then IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG Closed Deck Inserts that transform the block into a solid deck. The unique inserts feature small passages that allow needed coolant flow to the deck surface. The case halves are then CNC machined with O-ring receiver grooves around the bore surface as well as drilled and tapped to accept 1/2" head studs that greatly reduce head gasket failure during high cylinder pressure scenarios. Next, the short block is Deck Plate bored and honed that to 86.1mm on our in-house Sunnen SV-30 cylinder hone. IAG's in-house honing process is able to set piston to wall clearances tighter for a quieter running engine. The short block is measured and assembled using a new 2020 Subaru 2.0L WRX crankshaft that is matched to ACL or King main bearings. IAG-Spec H-Beam rods with ARP2000 rod bolts are utilized, along with King or ACL rod bearings. The case halves are sealed with new OEM case bolts and sealant. Finally, IAG-Spec 86.1mm forged pistons are installed, along with an OEM oil plug finishing off the short block.


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 .905 x 2.250" x .210" wall 9310 tool steel wrist pins with Tru Arc locks.


Each IAG 800 FA20 DIT Cylinder Head Set starts with new OEM castings from Subaru of America. For these long blocks we've also included Kelford "A" camshafts as well as new OEM cam towers, rockers, pivots, and valve shim caps.

The bare castings are visually inspected and the OEM guides are pressed out. The heads are then fixtured into our in-house Centroid 5-axis CNC Machine, one of the most advanced precision engine machining equipment in the world. The Centroid CNC performs a "pocket port" of the area under the valves, enlarging and blending the opening under the valves. The benefit of CNC porting is not only an efficient way of machining the heads it also offers consistent port results that are hard to achieve by hand. Once the Centroid completes the porting process the heads are drilled to fit larger 1/2" or 14mm head studs which are commonly used in high horsepower builds. Next, the OEM press-fit freeze plugs are removed, to avoid a common known failure in which they loosen and leak coolant into the engine oil as well as externally. To eliminate this problem each head is tapped and threaded plugs are installed. At this point, GSC Manganese-Bronze valve guides that are shaped to improve airflow are pressed into place then all the new intake and exhaust guides are diamond-honed in our honing station. The heads are then fixtured in our Newen Valve Guide and Seat Machine to cut all intake and exhaust seats with a multi-angle valve job that suits the flow characteristics of GSC's +1mm valves. The heads decks are then resurfaced using our TS-3000 BlockMate that cuts the aluminum to a smooth even finish. To remove debris and oils from the machining process, the heads are ultrasonically cleaned. Finally, the heads are reassembled using Kelford Dual Cylindrical Valve Springs and Retainers along with GSC Viton stem seals.

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.


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. 


IAG 800 FA20 2.0L Short Block Includes:

  • Case Halves -¬†Brand new OEM Subaru FA20 case halves, bored and honed to 86.1mm
  • Case Machining -¬†Modified for improved oiling
  • Case Machining -¬†Bored and honed to 86.1mm
  • O-Ringing¬†- Machine and O-Ring Deck Surface
  • Head Studs¬†- Machine Case for 1/2" head studs - *Head studs are sold separately
  • Pistons -¬†IAG-Spec 86.1mm Forged Pistons, Ring Set, and .210" x 2.250" Chromoly Wrist Pins.
  • Connecting Rods -¬†IAG-Spec H-Beam / ARP2000 Rod Bolts
  • Rod -¬†ACL or King XPG
  • Main Bearings -OEM or King XPG
  • Crankshaft -¬†New Subaru FA20 DIT WRX crankshaft
  • Case / Main Bolts -¬†Standard Subaru case bolts
  • Hardware¬†- OEM Oil Plug - comes preinstalled at the oil pan location

Compression Ratio:

  • 10.5:1 compression on standard gasket thickness.

IAG 800 CNC Pocket Ported FA20 DIT Cylinder Heads Package Includes:

  • (x2) Brand New Subaru OEM AW20 FA20 WRX DIT Cylinder Head Castings
  • (x8) GSC 35mm (+1mm) Intake Valves
  • (x8) GSC 30mm (+1mm) Exhaust Valves
  • (x16) Kelford Dual Cylindrical Valve Springs & Retainers
  • (x16) GSC Manganese-Bronze Valve Guides
  • (x16) GSC Valve Stem Seals
  • IAG Performance CNC Pocket Porting
  • Multi-Angle Valve Job
  • Drilling for compatibility with ¬Ĺ" or 14mm Head Studs
  • Threaded Coolant Plug Upgrade
  • Resurface
  • Ultrasonic Cleaning
  • Kelford "A" 272 Camshafts
  • (x2) OEM Cam Towers & Hardware
  • (x16) OEM Rocker Pivots
  • (x16) OEM Lifters
  • (x16) OEM Valve Lash Caps
  • Valve Lash Service

Gaskets, Hardware & Accessories:

  • Head Studs -¬†ARP 2000 1/2" Set
  • Head Gaskets -¬†OEM
  • Valve Cover Gaskets -¬†OEM
  • Cam Seals -¬†OEM
  • Valve Covers -¬†OEM
  • Timing Components¬†- OEM
  • Oil Pump/Timing Cover¬†- OEM
  • Wrist Pin Seal, Rear Main Seal & Separator Kit
  • Crankshaft Woodruff Key


Vehicle Fitment:

Additional hardware may be required to install this long block to the following vehicles, including but no limited to ECU, Sensors, Ancillaries, Covers, Pumps etc.

  • 2015-2021 Subaru WRX VA
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