GSC Power-Division Stainless Steel Intake Valves 36mm

2015-2021 Subaru STI


SKU: 2012-8We price match!

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The 36mm Stainless Steel Intake Valves will provide optimal performance under extreme conditions in the Subaru STI. 
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GSC Power-Division 36mm Stainless Steel Intake Valves

Intake Valve Specs:

  • 36mm in size
  • 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 stellite 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
  • 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
  • GSC has 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


GSC Power-Division 36mm Stainless Steel Intake Valves

When should you upgrade your valves? If you have a certain power goal in mind you will need to upgrade your valves. Especially if you upgrade to a larger duration camshaft and especially if you are going to run larger boost numbers that will surpass the limits of your factory valve springs. 

The GSC Power-Division 36mm Stainless Steel Intake Valves have been designed and built to help endure big horsepower and big boost numbers that would otherwise surpass the limits and capacity of your stock valves. The hardened materials will provide optimal performance under extreme conditions, and are ideal for those building a track-dedicated race car, rally car, or high-powered street car. 

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