IAG Performance IAG-ENG-C955BH IAG 950 EJ20 Closed Deck Case - w/ Bore & Hone / 14mm H.S.M

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 EJ20 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. The IAG 950 Closed Deck Case takes the strength one step further by adding provisions for our race-proven Fire-Lock™ head gaskets system, along with modifications for 14mm head studs. 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 EJ20 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
2014	Subaru	Forester	2.0XT Limited
2015	Subaru	Forester	2.0XT Premium
2014	Subaru	Forester	2.0XT Touring
2015	Subaru	Forester	2.0XT Touring
2008	Subaru	Forester	2.5 XT
2008	Subaru	Forester	Sports 2.5 XT
2010	Subaru	Forester	XT Sports
2011	Subaru	Forester	XT Sports
2012	Subaru	Forester	XT Sports
2011	Subaru	Forester	XT Touring
2012	Subaru	Forester	XT Touring
2013	Subaru	Forester	XT Touring
2002	Subaru	Impreza	WRX
2003	Subaru	Impreza	WRX
2004	Subaru	Impreza	WRX
2005	Subaru	Impreza	WRX
2006	Subaru	Impreza	WRX
2007	Subaru	Impreza	WRX
2008	Subaru	Impreza	WRX
2009	Subaru	Impreza	WRX
2010	Subaru	Impreza	WRX
2011	Subaru	Impreza	WRX
2012	Subaru	Impreza	WRX
2013	Subaru	Impreza	WRX
2010	Subaru	Impreza	WRX GT
2009	Subaru	Impreza	WRX Premium
2010	Subaru	Impreza	WRX Premium
2011	Subaru	Impreza	WRX Premium
2012	Subaru	Impreza	WRX Premium
2013	Subaru	Impreza	WRX Premium
2010	Subaru	Impreza	WRX SE
2004	Subaru	Impreza	WRX STI
2005	Subaru	Impreza	WRX STI
2006	Subaru	Impreza	WRX STI
2007	Subaru	Impreza	WRX STI
2008	Subaru	Impreza	WRX STI
2009	Subaru	Impreza	WRX STI
2010	Subaru	Impreza	WRX STI
2011	Subaru	Impreza	WRX STI
2012	Subaru	Impreza	WRX STI
2013	Subaru	Impreza	WRX STI
2010	Subaru	Impreza	WRX STI Special Edition
2006	Subaru	Impreza	WRX TR
2007	Subaru	Impreza	WRX TR
2010	Subaru	Legacy	2.5GT
2011	Subaru	Legacy	2.5GT
2012	Subaru	Legacy	2.5GT
2006	Subaru	Legacy	GT spec.B
2007	Subaru	Legacy	GT spec.B
2008	Subaru	Legacy	GT spec.B
2009	Subaru	Legacy	GT spec.B
2018	Subaru	WRX	6 Man
2019	Subaru	WRX	6 Man
2020	Subaru	WRX	6 Man
2021	Subaru	WRX	6 Man
2012	Subaru	WRX	Base
2013	Subaru	WRX	Base
2014	Subaru	WRX	Base
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
2013	Subaru	WRX	Limited
2014	Subaru	WRX	Limited
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
2014	Subaru	WRX	SE
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
2012	Subaru	WRX	STI
2013	Subaru	WRX	STI
2014	Subaru	WRX	STI
2015	Subaru	WRX	STI
2016	Subaru	WRX	STI
2013	Subaru	WRX STI	Base
2014	Subaru	WRX STI	Base
2015	Subaru	WRX STI	Base
2016	Subaru	WRX STI	Base
2017	Subaru	WRX STI	Base
2018	Subaru	WRX STI	Base
2019	Subaru	WRX STI	Base
2020	Subaru	WRX STI	Base
2021	Subaru	WRX STI	Base
2020	Subaru	WRX STI	Kanrai Edition
2015	Subaru	WRX STI	Launch Edition
2015	Subaru	WRX STI	Limited
2016	Subaru	WRX STI	Limited
2017	Subaru	WRX STI	Limited
2018	Subaru	WRX STI	Limited
2019	Subaru	WRX STI	Limited
2020	Subaru	WRX STI	Limited
2021	Subaru	WRX STI	Limited
2019	Subaru	WRX STI	S209
2016	Subaru	WRX STI	Series.HyperBlue
2017	Subaru	WRX STI	Sport
2018	Subaru	WRX STI	Sport
2019	Subaru	WRX STI	Sport
2020	Subaru	WRX STI	Sport
2021	Subaru	WRX STI	Sport
2018	Subaru	WRX STI	STI
2019	Subaru	WRX STI	STI
2020	Subaru	WRX STI	STI
2021	Subaru	WRX STI	STI
2014	Subaru	WRX STI	Tsurugi Edition
2018	Subaru	WRX STI	Type RA