{"product_id":"hks-85-91-toyota-corolla-gts-85-89-mr2-valve-spring-set","title":"HKS 85-91 Toyota Corolla GTS \/ 85-89 MR2 Valve Spring Set","description":"\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e \u003cspan itemprop=\"sku\"\u003e2201-RT004\u003c\/span\u003e | \u003cstrong\u003eUPC:\u003c\/strong\u003e 4957266642122\u003c\/p\u003e\n\n\u003ch4\u003e\u003cstrong\u003eHKS 85-91 Toyota Corolla GTS \/ 85-89 MR2 Valve Spring Set\u003c\/strong\u003e\u003c\/h4\u003e\n\u003cp\u003eHKS Valve Spring Set 2201-RT004 upgrades the 4A-GE 16-valve DOHC engine in 1985-1991 Toyota Corolla GTS models and 1985-1989 MR2. These springs maintain valve control at revs exceeding 8500 RPM to eliminate float during aggressive driving or racing. Direct replacement design works with stock or aftermarket cams up to 11mm lift for reliable power gains.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProgressive Coil Design:\u003c\/strong\u003e Reduces harmonic vibrations and resonance for smoother high-speed operation and extended durability\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncreased Spring Rate:\u003c\/strong\u003e Outer spring 6.3kg\/mm inner 2.8kg\/mm provides firm control over valves at peak RPM without excessive seat pressure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Strength Steel Construction:\u003c\/strong\u003e Chromium-vanadium alloy withstands fatigue from repeated high-rev cycles in tuned 4A-GE engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Retainer Kit:\u003c\/strong\u003e Includes matched steel retainers for precise fit and compatibility with OEM valves and seals\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Lift Compatibility:\u003c\/strong\u003e Handles up to 11.0mm lift and coil bind at 23.0mm for freedom in camshaft selection\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eProduct Notes\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eConfirm 4A-GE 16V engine code before purchase\u003c\/li\u003e\n\u003cli\u003ePair with HKS camshafts for full high-RPM potential\u003c\/li\u003e\n\u003cli\u003eArrives in protective HKS box to prevent shipping damage\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\u003eAdjust valve lash after install using OEM specs or cam card\u003c\/li\u003e\n\u003cli\u003eDirect bolt-on with stock hardware no modifications needed\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\u003e1985-1991\u003c\/td\u003e\n\u003ctd\u003eToyota\u003c\/td\u003e\n\u003ctd\u003eCorolla\u003c\/td\u003e\n\u003ctd\u003eGTS (AE86\/AE92 4A-GE)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1985-1989\u003c\/td\u003e\n\u003ctd\u003eToyota\u003c\/td\u003e\n\u003ctd\u003eMR2\u003c\/td\u003e\n\u003ctd\u003e(AW11 4A-GE NA\/SC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eWhy Choose HKS?\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eProven in JDM racing and drift competitions for decades\u003c\/li\u003e\n\u003cli\u003eManufactured to strict Japanese tolerances for consistent performance\u003c\/li\u003e\n\u003cli\u003eEngineered specifically for 4A-GE longevity under boost or high revs\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 fit AE86 Corolla GTS with 4A-GE?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Yes fits all 1985-1987 AE86 Corolla GTS and equivalent Levin\/Trueno models with 16V 4A-GE direct replacement\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What material are the springs?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e Heat-treated chromium-vanadium steel for superior fatigue resistance and spring rate retention over OEM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eQ:\u003c\/strong\u003e What is the warranty and install difficulty?\u003cbr\u003e\n      \u003cstrong\u003eA:\u003c\/strong\u003e HKS offers manufacturer defect coverage requires professional install to verify spring heights and clearances\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 \/ FedEx\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 Original HKS box 8 x 6 x 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 1.8 lbs\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"HKS","offers":[{"title":"Default Title","offer_id":40271617130575,"sku":"HKS2201-RT004","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/hks-85-91-toyota-corolla-gts-85-89-mr2-valve-spring-set-hks.jpg?v=1768434832","url":"https:\/\/www.blackopsautoworks.com\/products\/hks-85-91-toyota-corolla-gts-85-89-mr2-valve-spring-set","provider":"Black Ops Auto Works","version":"1.0","type":"link"}