{"product_id":"supertech-single-valve-spring-kit-w-titanium-retainers-nissan-skyline-rb25-w-hydraulic-lifters-sprk-2081-rb25","title":"Supertech Single Valve Spring Kit w\/ Titanium Retainers Nissan Skyline RB25 w\/ Hydraulic Lifters | SPRK-2081-RB25","description":"\u003ch2\u003eVehicle Fitment\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eNissan RB25 DOHC 24V engines\u003c\/li\u003e\n\u003cli\u003eNissan Skyline RB25DET hydraulic lifter applications\u003c\/li\u003e\n\u003cli\u003eNissan Skyline R33 RB25DET (non-NEO hydraulic lifter cylinder heads)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eDoes NOT fit:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eRB25 NEO cylinder heads\u003c\/li\u003e\n\u003cli\u003eSolid lifter conversion applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong\u003eSupertech SPRK-2081-RB25 Single Valve Spring Kit\u003c\/strong\u003e is designed for \u003cstrong\u003eNissan RB25 DOHC 24-valve engines equipped with hydraulic lifters\u003c\/strong\u003e. This performance valvetrain upgrade improves valve control, reduces the risk of valve float, and provides increased reliability for modified RB25DET engines running higher RPM, increased boost, and upgraded camshaft profiles.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eEngineered specifically for hydraulic lifter RB25 applications, this kit combines Supertech’s high-performance valve springs with lightweight titanium retainers and exhaust valve seat components to provide improved valvetrain stability while maintaining compatibility with hydraulic lifter cylinder heads.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Supertech Performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e SPRK-2081-RB25\u003c\/li\u003e\n\u003cli\u003eSingle valve spring kit\u003c\/li\u003e\n\u003cli\u003eDesigned for Nissan RB25 DOHC 24V hydraulic lifter engines\u003c\/li\u003e\n\u003cli\u003eIncludes valve springs, titanium retainers, and exhaust valve seats\u003c\/li\u003e\n\u003cli\u003eLightweight titanium retainers reduce valvetrain mass\u003c\/li\u003e\n\u003cli\u003eImproves valve control at elevated RPM\u003c\/li\u003e\n\u003cli\u003eDesigned for performance street and race applications\u003c\/li\u003e\n\u003cli\u003ePrecision-matched valvetrain components\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eKit Includes\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e24 Single Valve Springs\u003c\/li\u003e\n\u003cli\u003e24 Titanium Retainers\u003c\/li\u003e\n\u003cli\u003e12 Exhaust Valve Seats\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIncluded components:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eValve Springs:\u003c\/strong\u003e SPR-2081\/RB25\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTitanium Retainers:\u003c\/strong\u003e RET-NVG1015\/T1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Valve Seats:\u003c\/strong\u003e SS-2082-E\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e OEM intake valve seats are required and are not included.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eValve Spring Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Type:\u003c\/strong\u003e Single Spring\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Spring Diameter:\u003c\/strong\u003e 27.50mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInner Diameter:\u003c\/strong\u003e 20.00mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSeat Pressure:\u003c\/strong\u003e 85 lbs @ 30.60mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOpen Pressure:\u003c\/strong\u003e 171 lbs @ 9mm lift\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Net Lift:\u003c\/strong\u003e 9.90mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCoil Bind Height:\u003c\/strong\u003e 20.70mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSpring Rate:\u003c\/strong\u003e 9.60 lbs\/mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003ePerformance Benefits\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eReduces valve float at higher RPM\u003c\/li\u003e\n\u003cli\u003eImproves valve stability with upgraded camshafts\u003c\/li\u003e\n\u003cli\u003eMaintains consistent spring pressure during high-load operation\u003c\/li\u003e\n\u003cli\u003eLightweight titanium retainers reduce valvetrain weight\u003c\/li\u003e\n\u003cli\u003eEnhances reliability in turbocharged RB25 builds\u003c\/li\u003e\n\u003cli\u003eProvides improved control during aggressive driving conditions\u003c\/li\u003e\n\u003cli\u003eSupports performance upgrades while retaining hydraulic lifter operation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Upgrade Your RB25 Hydraulic Lifter Valvetrain?\u003c\/h2\u003e\n\u003cp\u003eThe factory RB25 valvetrain was designed for OEM power levels and factory operating conditions. When increasing boost, installing aftermarket camshafts, raising the RPM limit, or increasing cylinder head performance, upgraded valve springs help maintain proper valve control.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eSupertech SPRK-2081-RB25\u003c\/strong\u003e kit is ideal for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eModified RB25DET engines\u003c\/li\u003e\n\u003cli\u003eTurbocharged street builds\u003c\/li\u003e\n\u003cli\u003eHigh-performance engine refreshes\u003c\/li\u003e\n\u003cli\u003eTrack and drift applications\u003c\/li\u003e\n\u003cli\u003eVehicles with upgraded camshafts\u003c\/li\u003e\n\u003cli\u003eIncreased RPM applications\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e","brand":"Supertech","offers":[{"title":"Default Title","offer_id":43002603995232,"sku":"sptSPRK-2081-RB25","price":777.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1398\/9853\/files\/Supertech-Single-Valve-Spring-Kit-w-Titanium-Retainers-Nissan-Skyline-RB25-w-Hydraulic-Lifters-SPRK-2081-RB25.jpg?v=1785928193","url":"https:\/\/www.importimageracing.com\/products\/supertech-single-valve-spring-kit-w-titanium-retainers-nissan-skyline-rb25-w-hydraulic-lifters-sprk-2081-rb25","provider":"Import Image Racing","version":"1.0","type":"link"}