Stage 3 Pocket Ported Heads CM w/+1mm GSC Valves & GSC S2 Cams S20 Casting vehicle application data. 0L WRX crankshaft that is

0L WRX crankshaft that is matched to King main bearings

2004-20 STI

All IAG short blocks are balanced and blueprinted

IAG Stage 3 Extreme FA20 Closed Deck Short Block The IAG Stage 3 Extreme short block starts with new Subaru FA 2

IAG-Spec Tuff H-Beam connecting rods and ARP rod bolts are utilized along with ACL or King race rod bearings

Stage 3 Pocket Ported Heads CM w/+1mm GSC Valves & GSC S2 Cams S20 Casting vehicle application data. 0L WRX crankshaft that isIAG 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 OEM S20 head castings,