<https://www.fujiracing.com/product/stainless-steel-exhaust-valve-set-fren122-fren123/#product>
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"Air Flow Perfection.\r\nSwirl polished heads for smoother air flow over the valve\r\nBack cut to reduce valve weight for higher RPM, higher boost pressure, and allow for more aggressive cam profiles without increasing valve spring seat pressures\r\nValve 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\r\nIntake valves are a modified 21-4n stainless and exhausts are a modified 23-8n stainless material for high heat capacity while maintaining longevity\r\nValve 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\r\nValve tip lengths - we 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\r\nWe have also adjusted the keeper groove to properly balance intake and exhaust spring pressures to reduce the use of valve spring shims and maximize performance from our spring and retainer kits\r\nValves will work with an OEM Collets\r\n\r\n&amp;nbsp;"
<https://www.fujiracing.com/product/stainless-steel-exhaust-valve-set-fren122-fren123/>