IAG Performance Stage 2 Cylinder Head Package w/ GSC S2 Cams and Combustion Chamber Modification 2002-2005 WRX 2.0L S20 Heads
The IAG Stage 2 pocket ported head package starts with brand new WRX STI 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. The Centroid CNC ports the intake and exhaust runners under the valves and blends them to the valve seat. Once the Centroid completes the port process, 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. 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 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. The heads are then 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.
Stage 2 Ported Head Package Includes:
- (x2) Brand New Subaru 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
- (x16) OEM Lifter Buckets
- GSC Stage 2 Billet Camshafts
- IAG Performance CNC Pocket Porting
- Multi-Angle Valve Job
- Cam Lobe Machine Clearance
- Resurface
- Ultrasonic Cleaning
- Bench Lashed
- For Use with EJ25 Block
