Maintaining 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.
These 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.
With 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.
At 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.
- Supertech Single Valve Spring Kit with Titanium Retainers
- Part Number: SPRK-1012S-RB25
- Application: Nissan RB25 DOHC with hydraulic lifters
- Compatible with RB25DE and RB25DET engines
- Seat pressure: 78 lbs @ 30.60 mm
- Max lift: 10.60 mm
- Coil bind: 20.00 mm
- Spring rate: 7.30 lbs/mm
- Premium Chrome Silicon Vanadium steel alloy
- Computer-designed for controlled stress and harmonics
- Includes lightweight titanium retainers (RET-NVG1015/T1)
- Supports higher lift than some single-spring alternatives
- Helps reduce valve float at elevated rpm
- Suitable for mild to moderate performance cam profiles
- Maintains compatibility with hydraulic lifters
- Available from Terra Firma Automotive
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