Skip to content
LIVE INVENTORY DISABLED: DELAYS FROM GLOBAL SUPPLY CHAIN ISSUES ARE OCCURRING - (CLICK HERE FOR MORE DETAILS)
LIVE INVENTORY DISABLED: DELAYS FROM GLOBAL SUPPLY CHAIN ISSUES ARE OCCURRING - (CLICK HERE FOR MORE DETAILS)

IAG Performance Stage 1 Cylinder Head Package 2004-2006 STI / 2002-2005 Forester XT / 2005-2006 Legacy GT B25 Heads

SKU IAG-ENG-3010B
Original price $2,859.99 - Original price $2,859.99
Original price
$2,859.99
$2,859.99 - $2,859.99
Current price $2,859.99

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 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 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 a 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 Single Valve Springs and Titanium Retainers along with GSC Viton stem seals.


Stage 1 Head Package Includes:

  • (x2) Brand New Subaru OEM WRX STI 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
  • Multi-Angle Valve Job
  • Machined Cam Lobe Clearance
  • Resurface
  • Ultrasonic Cleaning

S1 B25 Head Fitment

Customer Reviews

No reviews yet
0%
(0)
0%
(0)
0%
(0)
0%
(0)
0%
(0)