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IAG Stage 2 Pocket Ported Heads Pkg Stage 2 Pocket Ported Heads w/Chamber Modification, w/ GSC S2 Cams S20 Casting

Engine Cylinder Head


IAG Stage 2 Pocket Ported Heads w/ GSC S2 Cams for 02-05 WRX S20 Casting.

  • New Head Castings, CNC Pocket Ported, Chamber Modification, with Standard Sized GSC Valves, GSC Springs, GSC S2 Cams Included
Pricing: $5,369.99

Free ground shipping on all order over $100.00 (some exclusions may apply)


Saab: 9-2X 05 - 05 Aero, Subaru: Impreza 02 - 05 WRX

  • Final valve lash must be set after installation.
  • Recommendations / Warranty: For use with stock cams or mild duration cams Assembly and professional installation recommended. Workmanship/parts warranty will only be available for professionally installed cylinder heads.
  • Recommended Power Level: < 550 Crank HP
  • Stage 2 Ported Head Package Includes: (x2) Brand New Subaru OEM S20 Cylinder Head Castings, (x8) GSC 36mm (Standard) Intake Valves, (x8) GSC 32mm (Standard) Exhaust Valves, (x16) GSC Single Valve Springs & Titanium Retainers, (x16) OEM Valve Guides, (x16) GSC Valve Stem Seals, (x1) GSC S2 Billet Camshaft Set, (x16) OEM valve lifters, IAG Performance CNC Pocket Porting, Multi-Angle Valve Job, Machined Cam Lobe Clearance, Ultrasonic Cleaning

IAG Stage 2 Pocket Port Cylinder Head Package: The head package centers around our popular CNC pocket porting program which was developed over the last several years. Pocket porting removes excess OEM casting flash and the material underneath the valves. By smoothing and blending this area under the valve seat, significant flow capability can be achieved. The IAG Stage 2 pocket ported head package starts with brand new WRX OEM S20 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. The Centroid CNC ports the intake and exhaust runners under the valves and blends them to the valve seat. The heads then 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. Next the heads are 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 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 Billet S2 camshafts that are intended for vehicles making 500-700 wheel horsepower. During the final assembly, the cams are matched to GSC Single Valve Springs and Titanium Retainers along with GSC Viton stem seals then bench-lashed to a tolerance that is close to final specifications.


  • IAG-ENG-3025SCS2
  • IAG-ENG-3025SCS2
  • 887753783110
  • IAG Performance
  • New


Shipping Information

  • Item Requires Shipping
  • 92.0 lbs.
  • W16.0000” x H12.0000” x L20.0000”
  • Free ground shipping on all order over $100.00 (some exclusions may apply)

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