GSC SS STD Intake & Super Alloy Exhaust Valves for WRX EJ205 EJ255 STi EJ257. Complete Set of Intake and Exhaust Valves GSC Power-Division Chrome Polished SS STD Intake & Super Alloy Exhaust Valves Set for Subaru WRX EJ205 EJ255 STi EJ257 Car Make: For Subaru Car Model: Impreza WRX / STi Years: 02-14 WRX / 04-20 STi Engine: EJ205, EJ207, EJ255, EJ257, EJ257B Valve Head Size: Standard Valve Head Diameter: 36mm (Intake) / 32mm (Exhaust) Face Type: Dish Stem Diameter: 5.96mm Valve Length: 104.4mm (Intake) / 104.65mm (Exhaust) Material: Stainless Steel (Intake) / Inconel (Exhaust). When creating our new valve line we set out to create the best performance longest lasting valves available to the aftermarket.Using advanced 3D design and simulation programs we have created a stronger and higher flowing valve head design. We flow test prototype valve heads in the specific applications to make sure we have the highest flowing valve head available on the market today. With the materials used we have less valve distortion at the face than any of the tested designs. Less distortion allows or better sealing under extreme conditions and more consistent performance threw the life of the valve. GSC Power-Division's new valves are sure to become the industries standard for sport compact performance valves. GSC Power-Division Super Alloy Exhaust Valves for EJ20/25 Turbo For those running high horsepower, high EGT set ups that need a valve that will last in 2000F conditions. The Super Alloy Exhaust valves have Chrome polished stems to create a smooth, durable finish for added life and better lubricity especially when paired with the GSC Manganese bronze valve guides. Strength, heat resistance and performance are engineered into every valve. Under head dish is maximized for weight savings while swirl polished and backcut heads promote better air flow without sacrificing durability. 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. 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. We 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 our spring and retainer kits.
Valves will work with an oem keeper/lock or when available our upgrade keeper/lock. It's not mandatory but it is suggested that any valve lock not be reused on performance applications do to material grooving. Please message us for a Return Authorization Number before sending anything back to avoid processing delays. Real Street Performance is unlike most "Race Shops". We are a fully functioning wholesale and retail distribution warehouse in addition to a dyno-equipped tuning and engine building facility.Our sales center and order fulfillment center operates with state of the art, industry leading software that allows us to get you ALL of the parts you need for your build quickly and correctly the first time without the headaches or excuses. Sign up to our Newsletter.