Stage 3 Pocket Ported Heads w/CM/+1mm Valves S20 Casting(Cams/Lifters Sold Sep) 2018-subaru-wrx sti-type ra The Stage 2 cams are

The Stage 2 cams are intended for vehicles making 500-700 wheel horsepower

the heads are ultrasonically cleaned

Internally baffled to ensure oil pickup stays submerged

but allow you to upgrade to 90A or Solid bushings in the future

25mm on our in-house Sunnen SV-30 the most advanced automotive cylinder hone available

Stage 3 Pocket Ported Heads w/CM/+1mm Valves S20 Casting(Cams/Lifters Sold Sep) 2018-subaru-wrx sti-type ra The Stage 2 cams areIAG 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,