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IAG Stage 5 Cylinder Head Package w/ Combustion Chamber Mod (Cams / Lifter Buckets Sold Separately) - Subaru WRX 2002-2005

IAG Stage 5 Cylinder Head Package w/ Combustion Chamber Mod (Cams / Lifter Buckets Sold Separately)

Subaru WRX 2002-2005

IAG Stage 5 Cylinder Head Package w/ Combustion Chamber Mod (Cams / Lifter Buckets Sold Separately) - Subaru WRX 2002-2005
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Part # IAG-ENG-3050SC
$5,499.99

Ships within 8 days

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Features & Product Details

RallySport Direct now carries highly sought-after high-performance upgrades and accessories brought to you by IAG Performance. 

 

This is the IAG Performance Stage 5 Cylinder Head Package With Combustion Chamber Mod. 

These heads utilize a CNC porting program for the S20 heads that have been developed over the past 5 years, and they have been tested on the most successful high-horsepower Subarus. These begin as brand new S20 head castings directly from Subaru Of America, where they are visually inspected and then fixtures at IAG's in-house Centroid 5-axis CNC machine which is considered to be of the most advanced piece of precision engine machining equipment available worldwide. 

 

FEATURES:

  • Centroid 5-Axis CNC machined in-house at IAG
  • The Centroid ports the intake and hard to reach exhaust "dog-leg" port runners
  • Everything starts with brand new Subaru S20 head castings that are visually inspected
  • The Centroid 5-Axis offers consistent port results that are hard to achieve by hand
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    COMBUSTION CHAMBER MODIFICATION

  • Once the Centroid completes the port process the heads receive the combustion chamber modification
  • The shapes of the chamber are machined to reduce compression and to improve the burn path
  • The heads then undergo a cam clearance machining process that removes material from the lifter area where large duration cam profiles are known to contact the castings
  • Short after, the heads are drilled to fit larger 1/2" or 14mm head studs which are commonly used in high-horsepower builds
  •  

    COMPONENTS AND MACHINING PROCESS

  • The OEM guides get pressed out 
  • Installed are Ferrea Copper / Bronze valve guides that offer greater heat dissipation and lubricity properties
  • The intake and exhaust guides are then diamond-honed
  • The heads are fixtured with IAG's Serdi 3.0 Valve Guide And Seat Machine
  • All intake and exhaust seats are cut with a multi-angle valve job that suits the flow characteristics of Ferrea Comp Plus +1mm valves
  • The head decks are resurfaced using IAG's TS-3000 BlockMate that cuts the aluminum to a smooth even finish
  • The heads are then ultrasonically cleaned to remove debris and oil from the machining process
  •  

    INCLUDES:

  • (2) Brand new Subaru S20 cylinder head castings
  • (8) Ferrea 37mm (+1mm) Comp Plus intake valves
  • (8) Ferrea 33mm (+1mm) Comp Plus exhaust valves
  • (16) Ferrea Dual Valve Springs with Titanium Retainers
  • (16) Ferrea Copper / Bronze Valve Guides
  • (16) Ferrea 6mm intake and exhaust valve stem seals
  • IAG Performance CNC porting
  • Multi-angle valve job
  • Drilling for compatibility for 1/2" or 14mm head studs
  • Cam clearancing
  • Resurface
  • Ultrasonic cleaning
  • Note: Workmanship/parts warranty will only be available for professionally installed cylinder heads.

     

     

     

     

     

     

     

     

     

     

     

     

     

     

    Specifications

    Brand: IAG Performance
    Head Alteration Required: No
    Includes Camshafts: No
    Machining Required: No
    Material: Aluminum
    QTY: Package
    Retainers: Titanium
    Springs Included: Yes
    Valves Included: Yes
    Mfgr. Warranty: 12 Months / 12k Miles
    Condition: New Product
    Return Policy:
    Standard

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