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IAG Performance IAG 800 FA20 DIT Closed Deck Case Half Set - w/ Bore & Hone IAG-ENG-C800BH
$4,123.99
It's no secret that the OEM Subaru case halves, or "block," aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru FA20 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary "Closed Deck" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. Each IAG 800 FA20 DIT WRX Case includes machining for 1/2" head studs and a cylinder gasket "o-ring" groove to aid in head gasket sealing. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures. The IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM FA20 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins.
This Part Fits:
| Year | Make | Model | Submodel | Notes |
|---|---|---|---|---|
| 2018 | Subaru | WRX | 6 Man | |
| 2019 | Subaru | WRX | 6 Man | |
| 2020 | Subaru | WRX | 6 Man | |
| 2021 | Subaru | WRX | 6 Man | |
| 2015 | Subaru | WRX | Base | |
| 2016 | Subaru | WRX | Base | |
| 2017 | Subaru | WRX | Base | |
| 2018 | Subaru | WRX | Base | |
| 2019 | Subaru | WRX | Base | |
| 2020 | Subaru | WRX | Base | |
| 2021 | Subaru | WRX | Base | |
| 2018 | Subaru | WRX | CVT | |
| 2019 | Subaru | WRX | CVT | |
| 2020 | Subaru | WRX | CVT | |
| 2021 | Subaru | WRX | CVT | |
| 2021 | Subaru | WRX | EyeSight | |
| 2015 | Subaru | WRX | Limited | |
| 2016 | Subaru | WRX | Limited | |
| 2017 | Subaru | WRX | Limited | |
| 2018 | Subaru | WRX | Limited | |
| 2019 | Subaru | WRX | Limited | |
| 2020 | Subaru | WRX | Limited | |
| 2021 | Subaru | WRX | Limited | |
| 2015 | Subaru | WRX | Premium | |
| 2016 | Subaru | WRX | Premium | |
| 2017 | Subaru | WRX | Premium | |
| 2018 | Subaru | WRX | Premium | |
| 2019 | Subaru | WRX | Premium | |
| 2020 | Subaru | WRX | Premium | |
| 2021 | Subaru | WRX | Premium | |
| 2019 | Subaru | WRX | Raui Edition | |
| 2017 | Subaru | WRX | Sport | |
| 2018 | Subaru | WRX | Sport | |
| 2019 | Subaru | WRX | Sport | |
| 2020 | Subaru | WRX | Sport | |
| 2021 | Subaru | WRX | Sport | |
| 2017 | Subaru | WRX | Sport-tech | |
| 2018 | Subaru | WRX | Sport-tech | |
| 2019 | Subaru | WRX | Sport-tech | |
| 2020 | Subaru | WRX | Sport-tech | |
| 2021 | Subaru | WRX | Sport-tech | |
| 2019 | Subaru | WRX | Sport-tech RS | |
| 2020 | Subaru | WRX | Sport-tech RS | |
| 2015 | Subaru | WRX | STI | |
| 2016 | Subaru | WRX | STI |
Specifications:
| Description_SHO | Case Half Set |
| Description_INV | IAG 800 FA20 DIT Closed Deck Case Half |
| Description_ASC | IAG 800 FA20 DIT WRX Closed Deck Case Includes: (x1) IAG 800 Closed Deck Converted Case Halves, (x1) Machined for 1/2" Head Studs, (X1) Machined for Head Gasket O-ring |
| Description_ASC | Please Note: Overbore must be performed (86.1mm is the preferred bore) before assembly! |
| Description_ASC | Attention: Special note about using ARP Case Bolts - IAG recommends line honing the case when using ARP Case Bolts to remove any distortion created by the hardware. IAG installs ARP CASE BOLTS with 30W engine oil using OEM SUBARU torque specs and procedures. Other torque specs and lubricants may lead to case distortion damage. |
| Description_KSW | IAG Performance |
| Description_LAB | 800 FA20 DIT Closed Deck Case Half Set - w/ Bore & Hone |
| Description_DES | IAG 800 FA20 DIT Closed Deck Case Half Set - w/ Bore & Hone |
| Description_APS | Subaru: WRX 15 - 21 6 Man / Base / CVT / EyeSight / Limited / Premium / Raui Edition / STI / Sport / Sport-tech / Sport-tech RS |
| Description_EXT | IAG 800 FA20 DIT Closed Deck Case Half Set - w/ Bore & Hone for 2015-21 Subaru WRX |
| Description_MKT | It's no secret that the OEM Subaru case halves, or "block," aren't exactly the strongest. IAG has developed a process to greatly improve the strength of the OEM Subaru FA20 Case Halves to combat the effects of high cylinder pressures brought on by increased power and boost. Our proprietary "Closed Deck" System works by supporting the top of the cylinder in the weakest areas and prevents movement and expansion which can lead to cracks and failures. Despite the additional material supporting the cylinder walls, there is no concerns with overheating or coolant flow because the area around the middle of the cylinder still maintains the same coolant area. The custom IAG closed deck inserts are machined with holes for oil and coolant to pass through the same as stock. Each IAG 800 FA20 DIT WRX Case includes machining for 1/2" head studs and a cylinder gasket "o-ring" groove to aid in head gasket sealing. If you're one of those people who prefer to do your own builds we now offer our legendary closed deck case halves for purchase separately. Simply install your crank, rods, and pistons to your own specifications and be confident that the case halves will take the power and prevent common cylinder wall failures. The IAG Closed Deck conversion is performed 100% in-house by our engineers and experts using state-of-the-art equipment. The IAG Closed Deck starts with a new OEM FA20 bare case. The case is loaded and fixtured to a 4th axis rotary indexer in our Haas VF4-SS CNC Vertical Machining Center. It is supported by the main journals using a precision ground 2-inch bar and tailstock which ensures the datum is the main journals. This method gives us a true reference point to perform all machining operations. A Rennishaw probe is utilized to check that the case is fixtured true, and once confirmed the machining process begins. |
| Description_FAB | Using brand new FA20 DIT Case / Stock Bore 86mm |
| Description_FAB | Power: The IAG 800 Closed Deck Case has a power output rating of 800 BHP |
| Description_TLE | IAG Performance 800 FA20 DIT Closed Deck Case Half Set - with Bore & Hone for 2015-21 Subaru WRX |
| Description_DEF | Engine Block |