GSC Power Division 32mm Standard Exhaust Valves (Set of 8) Subaru 2002-2014 WRX / 2004-2020 STI
When GSC set out to create the best performing and longest lasting valves available, they knew they would need to turn to the cutting edge of design technology. All GSC Power-Division performance valves are created with advance 3D design and simulation programs, resulting in a stronger and higher flowing valve head concept. All prototype valves are precision tested against the competition to ensure the highest performing design available. Higher quality materials mean less head distortion for better sealing under extreme conditions and more consistent performance through the life of the valve.
•Swirl polished heads for smoother airflow over the valve
•Back cut to reduce valve weight for higher rpm, higher boost pressure and allow for more aggressive cam profiles without increasing valve spring seat pressures.
•Valve stems are micro-polished to allow for less oil retention on the stem which creates less drag on the stem to guide for a smoother motion.
•Fully nitrated ( this includes the 45 which increases valve life and makes a better seal at the valve seat for improved cylinder pressure) also reduces carbon buildup on the backside of the valve.
•Intake valves are a modified 21-4n stainless and Exhausts are a modified 23-8n stainless material for high heat capacity while maintaining longevity.
•Valve tips are either hardened or have a stelite wafer tip fused so that the tip is within 5 Rockwell C of the rocker or valve tappet for extended life and less wear
•Valve tip lengths. They have taken extra time to adjust tip heights on the applications to require less tipping of the valve to maintain proper tip height for proper valvetrain geometry and to cut down on install times when setting valve lash.
•They have also adjusted the Keeper grove to properly balance intake and exhaust spring pressures to reduce the use of valve spring shims and maximize performance from their spring and retainer kits.
•Valves will work with an OEM keeper/lock or when available their upgraded keeper/lock. It's not mandatory but it is suggested that any valve lock not be reused on performance applications due to material grooving.