GSC Power-Division Stainless Steel Intake Valves +1mm - Subaru Models (inc. 2002-2014 WRX / 2004+ STI)
Manufacturer Part # 2014-8
Bundle Savings:MSRP: $136.00
•Swirl polished heads for smoother air flow 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 micropolished 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 valve train 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.
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QUESTIONS & ANSWERS
Q: +1mm valves/OEM guides KennyJ540 2 years agoAnswer
Will these valves work in conjunction with OEM valve guides, or will I have to upgrade the guides as well???
A: the stem is the same size as the OEM so only the head is larger. They can be used with an OEM valve guide or Manganese bronze valve guides (part number gsc3026 or gsc3028) which help to control heat in high horsepower applications. The 2014 is not a drop in valve the valve seat will need to be valve-jobbed to allow for the use of the over-sized valve head. This would be a good time to consider using a new guide as the expense with installing the Manganese valve guide is actually marginal at that point because the valve-job is already being performed for the over-sized valve head.
Brady R 2 years ago