{"product_id":"supertech-dohc-24v-w-solid-lifters-dual-valve-spring-kit-for-nissan-skyline-rb25-sptsprk-1012s-rb25","title":"Supertech Performance Single Valve Spring Kit With Titanium Retainers For A Nissan RB25 DOHC Hydraulic Lifter (78Lbs Seat Pressure) SPRK-1012S-RB25","description":"\u003cp dir=\"auto\"\u003eMaintaining stable valve control is essential when increasing rpm or installing more aggressive camshafts on the RB25. The Supertech Performance Single Valve Spring Kit with Titanium Retainers (part number SPRK-1012S-RB25) is designed for Nissan RB25 DOHC engines equipped with hydraulic lifters, offering a balanced combination of seat pressure and a more progressive spring rate suited to a range of performance builds.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eThese single springs are produced from premium Superclean Chrome Silicon Vanadium steel alloy, selected for its high tensile strength, fatigue resistance, and ability to retain structural memory during repeated high-rpm operation. Supertech employs computer design and analysis to keep wire stress within safe limits and to manage harmonics, helping reduce the likelihood of valve float while supporting long-term durability. Lightweight titanium retainers are included to lower valvetrain mass, allowing the springs to respond more effectively as engine speed rises.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eWith a seat pressure of 78 lbs at 30.60 mm, a spring rate of 7.30 lbs\/mm, and a maximum lift capacity of 10.60 mm, this kit provides slightly greater lift capability and a softer rate than higher-rate Supertech options. It is well matched to mild and moderate cam upgrades on RB25DE and RB25DET engines that retain hydraulic lifters, delivering improved control without excessive seat pressure.\u003c\/p\u003e\n\u003cp dir=\"auto\"\u003eAt Terra Firma Automotive, we supply this genuine Supertech valve spring and titanium retainer kit as a reliable upgrade for RB25 owners seeking better high-rpm stability. Choose Terra Firma Automotive for performance valvetrain components that support consistent and durable RB25 engine builds.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eSupertech Single Valve Spring Kit with Titanium Retainers\u003c\/li\u003e\n\u003cli\u003ePart Number: SPRK-1012S-RB25\u003c\/li\u003e\n\u003cli\u003eApplication: Nissan RB25 DOHC with hydraulic lifters\u003c\/li\u003e\n\u003cli\u003eCompatible with RB25DE and RB25DET engines\u003c\/li\u003e\n\u003cli\u003eSeat pressure: 78 lbs @ 30.60 mm\u003c\/li\u003e\n\u003cli\u003eMax lift: 10.60 mm\u003c\/li\u003e\n\u003cli\u003eCoil bind: 20.00 mm\u003c\/li\u003e\n\u003cli\u003eSpring rate: 7.30 lbs\/mm\u003c\/li\u003e\n\u003cli\u003ePremium Chrome Silicon Vanadium steel alloy\u003c\/li\u003e\n\u003cli\u003eComputer-designed for controlled stress and harmonics\u003c\/li\u003e\n\u003cli\u003eIncludes lightweight titanium retainers (RET-NVG1015\/T1)\u003c\/li\u003e\n\u003cli\u003eSupports higher lift than some single-spring alternatives\u003c\/li\u003e\n\u003cli\u003eHelps reduce valve float at elevated rpm\u003c\/li\u003e\n\u003cli\u003eSuitable for mild to moderate performance cam profiles\u003c\/li\u003e\n\u003cli\u003eMaintains compatibility with hydraulic lifters\u003c\/li\u003e\n\u003cli\u003eAvailable from Terra Firma Automotive\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Supertech","offers":[{"title":"Default Title","offer_id":31311202451518,"sku":"sptSPRK-1012S-RB25","price":758.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1992\/7247\/products\/SPRK-1012S-RB25.png?v=1574888172","url":"https:\/\/tfaspeed.com\/products\/supertech-dohc-24v-w-solid-lifters-dual-valve-spring-kit-for-nissan-skyline-rb25-sptsprk-1012s-rb25","provider":"Terra Firma Automotive","version":"1.0","type":"link"}