IAG Stage 1 Cylinder Head Package w/ GSC S1 Cams for 18-20 STI N25 Casting. 2014-subaru-impreza-wrx sti limited Decking head gasket surface required

Decking head gasket surface required Note: Attention: Special note about using ARP Case Bolts - IAG uses specific torque specs and procedures please refer to the guide provided

210" 9310 Steel Wrist Pins are added to finish the Stage 2

Pocket porting removes excess OEM casting flash and the material underneath the valves

Once the Centroid completes the port process the heads receive our combustion chamber modification in which the shapes of the chamber are machined to reduce compression and improve the burn path

These are ideal for the person that is looking for the ultimate performance gains at the road course

IAG Stage 1 Cylinder Head Package w/ GSC S1 Cams for 18-20 STI N25 Casting. 2014-subaru-impreza-wrx sti limited Decking head gasket surface requiredIAG 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 N25 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