Stage 2 Pocket Ported Cyl Heads, Chamber Mod, S20 Casting(Cams/Lifters Not Inc) 2017-subaru-wrx sti-base while still increasing oil capacity

while still increasing oil capacity up to 30% over OEM

Features: Composite Material Stainless Steel Ring (AISI304) Silicone Beading 100mm Bore

Once all the new intake and exhaust guides are in place they are diamond-honed in our honing station

but maintain spool

The gaskets are not recommended for blocks or heads that are o-ringed

Stage 2 Pocket Ported Cyl Heads, Chamber Mod, S20 Casting(Cams/Lifters Not Inc) 2017-subaru-wrx sti-base while still increasing oil capacityIAG Stage 2 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,