IAG Performance IAG-ENG-3010W Stage 1 Cylinder Head Package W25 Casting (Cams / Lifters Sold Separately)

IAG Stage 1 Cylinder Head Package: IAG's Stage 1 cylinder heads are intended for those looking for a cost-effective OEM+ replacement. Each package starts with brand new WRX STI W25 OEM head castings, directly from Subaru of America. The bare castings are visually inspected and then fixtured into our in-house Centroid 5-axis CNC Machine. This is one of the most advanced pieces of precision engine machining equipment in the world. In the Centroid, the heads undergo a cam clearance machining process which removes material from the lifter area where larger lift and duration cam profiles are known to contact the castings. Then the heads are then fixtured in our Serdi 3.0 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 standard size 36mm Intake and 32mm Exhaust valves. At this point, the heads' decks are resurfaced using our TS-3000 BlockMate, which cuts the aluminum to a smooth, even finish. Next, the heads are ultrasonically cleaned to remove debris and oils from the machining process. Finally, the heads are reassembled using GSC Single Valve Springs and Titanium Retainers along with GSC Viton stem seals.

This Part Fits:

Year	Make	Model	Submodel	Notes
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
2014	Subaru	Impreza	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
2015	Subaru	WRX STI	Limited
2016	Subaru	WRX STI	Limited
2017	Subaru	WRX STI	Limited
2018	Subaru	WRX STI	Limited
2017	Subaru	WRX STI	Sport
2018	Subaru	WRX STI	Sport