IAG Stage 3 Pocket Ported Heads w/ +1mm GSC Valves for 08-17 STI W25 Casting (Cams / Lifters Sold Separately). 2011-subaru-impreza-wrx The flange features a sealing

The flange features a sealing O-ring for easier installation and removal

the cams are matched to Ferrea Dual Valve Springs and Titanium Retainers along with Ferrea valve stem seals then bench-lashed to a tolerance that is close to final specifications

GTIN: 00887753779069

Then IAG machines the case halves assembled together in our Haas VF-4SS CNC mill to accept the IAG CLOSED Deck Inserts that transform the block into a solid deck

The IAG Stage 2 pocket ported head package starts with brand new WRX STI OEM V25 head castings

IAG Stage 3 Pocket Ported Heads w/ +1mm GSC Valves for 08-17 STI W25 Casting (Cams / Lifters Sold Separately). 2011-subaru-impreza-wrx The flange features a sealingIAG 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 3 pocket ported head package starts with brand new WRX STI OEM W25 head castings,