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Ej20 engine valve adjustment4/28/2023 ![]() 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.Intake valves are a modified 21-4n stainless steel. ![]() 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.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.Swirl polished heads for smoother air flow over the valve.Less distortion allows better sealing under extreme conditions and more consistent performance thru the life of the valve. ![]() The materials used by GSC have less valve distortion at the face than any of the tested designs. ![]() GSC flow tests prototype valve heads to specific applications, making sure they have the highest flowing valve head available on the market today. Using advanced 3D design and simulation programs GSC created a stronger and higher flowing valve head design. GSC set out to create the best performance, longest lasting Subaru oversize (+1) 37mm intake valves available to the aftermarket. ![]()
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