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IAG Performance : 800 FA20 Low Compression 10.5:1 Closed Deck Short Block - Subaru BRZ/Toyota 86

IAG Performance : 800 FA20 Low Compression 10.5:1 Closed Deck Short Block - Subaru BRZ/Toyota 86

Regular price $11,299.95 AUD
Regular price Sale price $11,299.95 AUD
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The IAG 800 Long Block has a power output rating of 800BHP.


The IAG 800 Short Block is designed for modified FA20 Subaru BRZs or FT86s that need a stronger short block to support increased cylinder pressures created by larger aftermarket turbochargers. The IAG 800 short block features our proprietary closed-deck cylinder support system to strengthen the OEM FA20 cylinder walls. The short block is fitted with IAG Spec H-Beam forged connecting rods. Head gasket sealing is handled with the addition of an o-ring and 1/2" head studs for additional compression of the head gasket. These upgrades are ideal for those seeking to get the most out of their full bolt-on and upgraded turbo BRZs.


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 FA20 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.


Adequate oil flow is critical to performance and relibility. It's no secret that the OEM cases from Subaru leave something to be desired in the oiling department. Our machinists carefully inspect and modify the internal oil passages of each new OEM case used in the IAG 600 Short Block to ensure proper flow and reliability.


Each IAG 800 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 carbon steel wrist pins with Tru Arc locks. Note: This block features 10.5:1 Lower Compression pistons which are ideal for higher boost and larger turbochargers.


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 BRZ/FT86 Low Compression 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. 10.5:1 Compression
  • Connecting Rods -¬†IAG-Spec H-Beam / ARP2000 Rod Bolts
  • Rod -¬†ACL or King XPG
  • Main Bearings¬†-OEM or King XPG
  • Crankshaft -¬†New Subaru FA20 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.

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.

  • 2012-2021 Subaru BRZ ZC6
  • 2012-2021 Toyota 86 ZN6
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