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  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi
  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi
  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi
  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi
  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi
  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi
  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi
  • IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi

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    IAG Performance

    IAG Stage 3 Pocket Ported Cylinder Head Package w/ +1mm GSC Valves | 2007 Subaru STi

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    2007 Subaru STi Stage 3 Pocket Ported Cylinder Head Package by IAG

    The head package centers around our popular CNC pocket porting program which was developed over the last several years. Pocket porting removes excess OEM casting flash and the material underneath the valves. By smoothing and blending this area under the valve seat, significant flow capability can be achieved.

    The IAG Stage 3 pocket ported head package starts with brand new WRX STI OEM head castings, directly from Subaru of America. The bare castings are visually inspected then fixtured into our in-house Centroid 5-axis CNC Machine, one of the most advanced 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. Next, 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 +1mm valves.

    At this point, the heads decks are resurfaced using our TS-3000 BlockMate that cuts the aluminum to a smooth even finish. Then, 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. If you prefer, the heads can be assembled using GSC Billet S2 camshafts that are intended for vehicles making 500-700 wheel horspower.

    Features

    • Brand New Subaru OEM Cylinder Head Castings
    • GSC 37mm (+1mm) Intake Valves
    • GSC 33mm (+1mm) SuperAlloy Exhaust Valves
    • GSC Single Valve Springs & Titanium Retainers
    • OEM Valve Guides
    • GSC Valve Stem Seals
    • IAG Performance CNC Pocket Porting
    • Multi-Angle Valve Job
    • Machined Cam Lobe Clearance
    • Resurface
    • Ultrasonic Cleaning
    • Option to include GSC Billet S2 Cams (rated up to 500-700whp)

    Please Note: Assembly and professional installation recommended. Workmanship/parts warranty will only be available for professionally installed cylinder heads.

    Applications

    • 2007 Subaru STi

    Specifications (GSC S2 In. Cams)

    • ADV Duration: 272°
    • Duration @ 0.040": 233°
    • Peak Lift: 10.80mm
    • Center Line: 125°

    Specifications (GSC S2 Ex. Cams)

    • ADV Duration: 272°
    • Duration @ 0.040": 233°
    • Peak Lift: 10.50mm
    • Center Line: 115°

    What's In The Box?

    • 2 - OEM Cylinder Head Castings
    • 8 - GSC 37mm Intake Valves
    • 8 - GSC 33mm Exhaust Valves
    • 16 - GSC Single Valve Springs & Titanium Retainers
    • 16 - OEM Valve Guides
    • 16 - GSC Valve Stem Seals
    • GSC S2 Billet Cams (OPTIONAL)
    • OEM Lifter Buckets (OPTIONAL)

    Warranty

    • Manufacturer Standard Warranty. Workmanship/parts warranty will only be available for professionally installed cylinder heads.

    2007 Subaru STi Stage 3 Pocket Ported Cylinder Head Package by IAG

    The head package centers around our popular CNC pocket porting program which was developed over the last several years. Pocket porting removes excess OEM casting flash and the material underneath the valves. By smoothing and blending this area under the valve seat, significant flow capability can be achieved.

    The IAG Stage 3 pocket ported head package starts with brand new WRX STI OEM head castings, directly from Subaru of America. The bare castings are visually inspected then fixtured into our in-house Centroid 5-axis CNC Machine, one of the most advanced 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. Next, 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 +1mm valves.

    At this point, the heads decks are resurfaced using our TS-3000 BlockMate that cuts the aluminum to a smooth even finish. Then, 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. If you prefer, the heads can be assembled using GSC Billet S2 camshafts that are intended for vehicles making 500-700 wheel horspower.

    Features

    • Brand New Subaru OEM Cylinder Head Castings
    • GSC 37mm (+1mm) Intake Valves
    • GSC 33mm (+1mm) SuperAlloy Exhaust Valves
    • GSC Single Valve Springs & Titanium Retainers
    • OEM Valve Guides
    • GSC Valve Stem Seals
    • IAG Performance CNC Pocket Porting
    • Multi-Angle Valve Job
    • Machined Cam Lobe Clearance
    • Resurface
    • Ultrasonic Cleaning
    • Option to include GSC Billet S2 Cams (rated up to 500-700whp)

    Please Note: Assembly and professional installation recommended. Workmanship/parts warranty will only be available for professionally installed cylinder heads.

    Applications

    • 2007 Subaru STi

    Specifications (GSC S2 In. Cams)

    • ADV Duration: 272°
    • Duration @ 0.040": 233°
    • Peak Lift: 10.80mm
    • Center Line: 125°

    Specifications (GSC S2 Ex. Cams)

    • ADV Duration: 272°
    • Duration @ 0.040": 233°
    • Peak Lift: 10.50mm
    • Center Line: 115°

    What's In The Box?

    • 2 - OEM Cylinder Head Castings
    • 8 - GSC 37mm Intake Valves
    • 8 - GSC 33mm Exhaust Valves
    • 16 - GSC Single Valve Springs & Titanium Retainers
    • 16 - OEM Valve Guides
    • 16 - GSC Valve Stem Seals
    • GSC S2 Billet Cams (OPTIONAL)
    • OEM Lifter Buckets (OPTIONAL)

    Warranty

    • Manufacturer Standard Warranty. Workmanship/parts warranty will only be available for professionally installed cylinder heads.

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    MAP Limited Lifetime Warranty

    1.) All MAPerformance in-house fabricated parts include a Limited Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferrable. If the product fails it would need to be determined by MAPerformance that it is due to manufacturing defects in materials or workmanship.

    2.) This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. MAPerformance will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.). Warranty claims must be submitted to MAPerformance for review.

    3.) You must create a support ticket to acquire your return authorization number prior to returning the product.

    4.) Warranty claims will not be honored if the product was not purchased through an approved dealer.

    For warranty evaluation please create a support ticket via this form here.

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