The IAG 750 CNC Pocket Ported Competition Cylinder Heads are designed with the weekend racer in mind. These heads work great for cars with some race track duty (road, rally, auto-x, drag) and are designed to support up to 750 BHP with supporting mods. These heads include upgraded GSC Standard Size Valves, GSC Viton Valve Stem Seals, IAG Stage 1 Valve Springs with Titanium Retainers, and OEM Keepers. GSC S1 Camshafts are available with OEM valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks. Each IAG 750 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S1 Camshafts and OEM Lifter Buckets for valve adjustment. The bare castings are visually inspected and then fixtured into our in-house Centroid 5-axis CNC Machine. 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 Newen 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 IAG Stage 1 Single Valve Springs and Titanium Retainers along with GSC Viton stem seals.
This Part Fits:
| Year |
Make |
Model |
Submodel |
Notes |
| 2002 |
Subaru |
Impreza |
WRX |
|
| 2003 |
Subaru |
Impreza |
WRX |
|
| 2004 |
Subaru |
Impreza |
WRX |
|
| 2005 |
Subaru |
Impreza |
WRX |
|
Specifications:
| Prop 65 - Short Label |
WARNING: Cancer and Reproductive Harm - www.p65warnings.ca.gov |
| Prop 65 (C, R or CR) |
CR |
| Prop 65 Yes/No |
Yes |
| Title |
IAG 750 CNC Pocket Ported S20 Competition Cylinder Heads Package w/ Combustion Mod & GSC S1 Cams & Lifters for 02-05 WRX |
| Power Rating |
750 BHP |
| 306 |
Yes |
| 10271 |
Yes |
| 10582 |
No |
| 10267 |
Yes |
| 10266 |
Yes |
| 6629 |
32 |
| 9795 |
104.37 |
| 9956 |
Stainless Steel |
| 10249 |
6 |
| 3390 |
Performance |
| 6628 |
36 |
| 9794 |
104.40 |
| 9797 |
Stainless Steel |
| 10248 |
6 |
| 14 |
20 |
| 10 |
Aluminum |
| 30 |
Yes |
| 10364 |
No |
| 10269 |
Viton |
| 8789 |
Yes |
| 9798 |
Titanium |
| 10024 |
Yes |
| 8788 |
Yes |
| 9799 |
Yes |
| 627 |
72 |
| 24 |
16 |
| Description_KSW |
IAG Performance |
| Description_LAB |
750 CNC Pocket Ported S20 Comp Cylinder Head w/ Com Mod & GSC S1 Cams & Lifters |
| Description_DES |
IAG 750 CNC Pocket Ported S20 Comp Cylinder Head - Com Mod/GSC S1 Cams & Lifters |
| Description_APS |
Subaru: Impreza 02 - 05 WRX |
| Description_EXT |
IAG 750 CNC Pocket Ported S20 Competition Cylinder Heads Package w/ Combustion Mod & GSC S1 Cams & Lifters for 02-05 WRX |
| Description_MKT |
The IAG 750 CNC Pocket Ported Competition Cylinder Heads are designed with the weekend racer in mind. These heads work great for cars with some race track duty (road, rally, auto-x, drag) and are designed to support up to 750 BHP with supporting mods. These heads include upgraded GSC Standard Size Valves, GSC Viton Valve Stem Seals, IAG Stage 1 Valve Springs with Titanium Retainers, and OEM Keepers. GSC S1 Camshafts are available with OEM valve lifter buckets. We also offer an optional chamber modification service (see below) for EJ20 heads to allow use on EJ25 short blocks. Each IAG 750 Cylinder Head Set starts with new OEM castings from Subaru of America. The first step is to select your Year and Model of vehicle so that we may provide you with the right castings to fit your project. Next, you'll select whether or not you want to include our optional GSC camshaft package. If selected, these heads will include new GSC S1 Camshafts and OEM Lifter Buckets for valve adjustment. The bare castings are visually inspected and then fixtured into our in-house Centroid 5-axis CNC Machine. 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 Newen 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 IAG Stage 1 Single Valve Springs and Titanium Retainers along with GSC Viton stem seals. |
| Description_FAB |
New Head Castings with Upgraded GSC Standard Size Valves, IAG Stage 1 Valve Springs with Titanium Retainers |
| Description_FAB |
Power: The IAG 750 Cylinder Head Package has a power output rating of 750 BHP. |
| Description_TLE |
IAG Performance 750 CNC Pocket Ported S20 Competition Cylinder Heads Package with Combustion Mod & GSC S1 Cams & Lifters for 02-05 WRX |
| Description_SHO |
750 Cylinder Head |
| Description_INV |
IAG 750 Comp Cylinder Head Package |
| Description_ASC |
IAG 750 CNC Pocket Ported Competition Cylinder Head Package Includes: (x2) Brand New Subaru OEM Cylinder Head Castings, (x8) GSC 36mm (Standard) Intake Valves, (x8) GSC 32mm (Standard) Exhaust Valves, (x16) IAG Stage 1 Single Valve Springs & Titanium Retainers, (x16) GSC Valve Guides, (x16) GSC Valve Stem Seals, IAG Performance CNC Pocket Porting, Multi-Angle Valve Job, Drilled for 1/2" or 14mm Head Studs, Machined Cam Lobe Clearance, Resurface, Ultrasonic Cleaning. Optional Camshaft Package Also Includes: GSC S1 Camshafts, (x16) OEM Lifter Buckets, Bench Valve Lash Service (Final Lash Should be Checked and Adjusted Once Heads are Installed). |
| Description_ASC |
For use with stock cams or mild duration cams. |
| Description_ASC |
Assembly and professional installation recommended. |
| Description_ASC |
Workmanship/parts warranty will only be available for professionally installed cylinder heads. |
| Description_DEF |
Engine Cylinder Head Set |
