Click on image to zoom

IAG Stage 1 Head Package Stage 1 Cylinder Head Package w /GSC S1 Cams for 02-05 WRX S20 Casting

Engine Cylinder Head Set


IAG Stage 1 Cylinder Head Package w/ GSC S1 Cams for 02-05 WRX S20 Casting

  • New Head Castings, GSC Valves, GSC Springs and Retainers
Pricing: $4,599.99

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


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

Stage 1 Head Package Includes: (x2) Brand New Subaru OEM WRX 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 S1 Camshafts, (x16) OEM Lifter Buckets, Multi-Angle Valve Job, Machined Cam Lobe Clearance, Resurface, Ultrasonic Cleaning, Bench Lashed.

IAG Stage 1 Cylinder Head Package with GSC Stage 1 Cams: IAG's Stage 1 cylinder heads are intended for those looking for a cost-effective OEM+ replacement. Each package starts with brand new WRX S20 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 assembled using GSC Single Valve Springs and Titanium Retainers along with GSC Viton stem seals.


  • IAG-ENG-3015SS1
  • IAG-ENG-3015SS1
  • 887753783219
  • 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)

Customer Reviews

Comment Total Reviews (0)

Write the First Review!

You must login to post a review.