Stage 3 Pocket Ported Heads w/ +1mm GSC Valves & GSC S2 Cams S20 Casting 2017-subaru-wrx sti-base Dimension: 8 x 10 x

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Stage 3 Pocket Ported Heads w/ +1mm GSC Valves & GSC S2 Cams S20 Casting 2017-subaru-wrx sti-base Dimension: 8 x 10 xIAG Stage 3 Pocket Port Cylinder Head Package: 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 2 pocket ported head package starts with brand new WRX STI OEM N25 head castings,

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