{"product_id":"gsc-p-d-subaru-ej-series-conical-valve-spring-and-ti-retainer-kit","title":"GSC P-D Subaru EJ Series Conical Valve Spring and Ti Retainer Kit","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003e5076\u003c\/span\u003e\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eGSC P-D Subaru EJ Series Conical Valve Spring and Ti Retainer Kit 2002-2021 WRX STI\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eThe GSC P-D Subaru EJ Series Conical Valve Spring and Ti Retainer Kit delivers precise valvetrain control for EJ20 and EJ25 turbo engines in Subaru WRX STI Impreza Forester and Legacy models from 2002 to 2021. Conical springs cut valvetrain mass by 28 percent over stock while titanium retainers drop 4 grams per valve for reliable high RPM operation past 9000 RPM. This kit supports 500 plus wheel horsepower builds with dual valve springs maintaining 98 pounds seat pressure and 238 pounds open at 0.380 inch lift.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eConical Beehive Design:\u003c\/strong\u003e Progressive dual rate springs with 1.150 inch closed height reduce mass harmonics and resonance for smoother high RPM stability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitanium Retainers:\u003c\/strong\u003e Lightweight 10 gram Ti retainers machined with precise lock grooves ensure retention under 40 psi boost and 1.2mm lift cams\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh Pressure Ratings:\u003c\/strong\u003e 98 lbs closed at 1.150 inches 238 lbs open at 0.380 inches lift coil bind at 1.000 inches prevent dropped valves\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChromoly Steel Springs:\u003c\/strong\u003e Heat treated premium wire 0.079 inch thick inner ID 0.510 inch outer OD 0.945 inch endure 1000 plus hours track abuse\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Kit:\u003c\/strong\u003e 16 springs and 16 retainers direct OEM replacement boosts rev limit and power in turbo EJ applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eValve locks seats and spring seats sold separately verify compatibility with your setup\u003c\/li\u003e\n\u003cli\u003eCheck installed spring height and retainer to guide clearance before full assembly\u003c\/li\u003e\n\u003cli\u003eKit weighs 3.65 pounds ships in 10 x 6 x 4 inch box\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProfessional installation recommended.\u003c\/li\u003e\n\u003cli\u003eMeasure installed height after valve job to confirm pressures match specs\u003c\/li\u003e\n\u003cli\u003eCompatible with stock heads aftermarket cams and GSC valve locks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eThis Part Fits\u003c\/h4\u003e\n\u003ctable border=\"1\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eYear\u003c\/th\u003e\n\u003cth\u003eMake\u003c\/th\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth\u003eSubmodel\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2002-2007\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2008-2021\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2021\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eWRX\u003c\/td\u003e\n\u003ctd\u003eAll\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2021\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eImpreza\u003c\/td\u003e\n\u003ctd\u003eWRX STI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2004-2013\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eForester\u003c\/td\u003e\n\u003ctd\u003eXT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2005-2009\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eLegacy\u003c\/td\u003e\n\u003ctd\u003eGT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2005-2006\u003c\/td\u003e\n\u003ctd\u003eSubaru\u003c\/td\u003e\n\u003ctd\u003eSaab 9-2X\u003c\/td\u003e\n\u003ctd\u003eAero\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhy Choose GSC?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eDeveloped for record setting Subaru race cars in Formula Drift and rallycross\u003c\/li\u003e\n\u003cli\u003eCNC machined in USA with dyno tested springs for consistent performance\u003c\/li\u003e\n\u003cli\u003eLifetime warranty against spring failure when properly installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003e\u003cstrong\u003eFrequently Asked Questions\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e Does this kit fit stock EJ257 heads on 2004-2021 STI?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Yes direct bolt on for all EJ20 EJ25 turbo heads including STI WRX and Legacy GT confirm no head machining interferes with retainer height\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What material are the springs and retainers?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Premium chromoly steel springs with super clean EDM cut ends titanium 6AL4V retainers both shot peened for fatigue resistance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What warranty applies and install tips?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Lifetime on springs against sagging or breaking requires professional install with proper height check and matching locks\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eShipping \u0026amp; Handling\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eMethod:\u003c\/strong\u003e UPS Ground\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAvailability:\u003c\/strong\u003e In stock - ships same or next business day\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Secure foam packed box 10 x 6 x 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 3.65 pounds\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GSC Power Division","offers":[{"title":"Default Title","offer_id":39735889461327,"sku":"GSC5076","price":517.85,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/gsc-p-d-subaru-ej-series-conical-valve-spring-and-ti-retainer-kit-valve-springs-retainers-gsc-power-division.jpg?v=1717523164","url":"https:\/\/www.blackopsautoworks.com\/products\/gsc-p-d-subaru-ej-series-conical-valve-spring-and-ti-retainer-kit","provider":"Black Ops Auto Works","version":"1.0","type":"link"}