Supertech Dual Valve Spring Kit w/ Titanium Retainers Nissan Skyline RB25 DOHC w/Solid Lifters | SPRK-TS1015-RB25

Overview

The Supertech SPT Dual Valve Spring Kit (SPRK-TS1015-RB25) is a high-performance valve spring upgrade engineered specifically for the Nissan Skyline RB25 DOHC 24-valve engine equipped with solid lifters. Designed for serious performance builds, forced induction applications, and high-rpm race engines, these dual valve springs provide dramatically increased spring pressure and improved valve control far beyond OEM specifications. Whether you're building a track-ready Skyline or a high-boost street car, these Supertech valve springs deliver the reliability and precision required to keep your valvetrain in check at the limits.

Key Features & Benefits

• Dual Spring Design - Concentric inner and outer spring configuration provides significantly higher seat and open pressures compared to stock single springs, preventing valve float at high RPM and under aggressive cam profiles.
• High-Strength Steel Construction - Manufactured from premium chrome silicon vanadium steel alloy for exceptional fatigue resistance, heat tolerance, and longevity under sustained high-performance use.
• Supertech Performance Engineering - Each spring is precision-wound and heat-treated to maintain consistent spring rate and load tolerances, ensuring uniform valvetrain behavior across all six cylinders.
• RB25 DOHC Specific Fitment - Engineered to exact dimensional specifications for the Nissan RB25 DOHC 24V engine with solid lifters, ensuring proper installed height, coil bind clearance, and retainer compatibility.
• Compatible with Aggressive Camshaft Profiles - Higher open pressures support aftermarket performance camshafts with increased lift and duration, making this kit ideal for full engine builds.
• Complete Kit - Includes all springs required for a full engine application, eliminating the need for separate sourcing of inner and outer springs.
• Drop-In Performance Upgrade - Designed as a direct replacement for OEM valve springs with no head modifications required when used within recommended cam lift specifications.

What's Included

• 24x Outer valve springs (intake and exhaust)
• 24x Inner valve springs (intake and exhaust)
• Full hardware set for complete RB25 DOHC 24V engine application

Specifications

Fitment & Compatibility

This Supertech dual valve spring kit is designed exclusively for the Nissan RB25 DOHC 24-valve engine equipped with solid lifters. Compatible vehicle applications include:

• Nissan Skyline R33 GTS-T / GT-R (RB25DET)
• Nissan Skyline R34 GT-T / GT-Four (RB25DET NEO and non-NEO)
• Nissan Stagea (RB25DET variants with solid lifter conversion)

Important: This kit is intended for use with solid lifters only. Verify your engine configuration prior to ordering. If your RB25 is equipped with hydraulic lifters, a solid lifter conversion will be required. Always confirm installed spring height, coil bind clearance, and retainer-to-seal clearance during engine assembly. Professional engine building experience is strongly recommended.

Installation

Installation of the Supertech SPT Dual Valve Spring Kit requires removal of the cylinder head and use of a valve spring compressor tool. This is not a bolt-on installation and should be performed by an experienced engine builder or professional machine shop. During installation, verify correct installed height using shims if necessary, check coil bind clearance (minimum 0.060" recommended), and confirm retainer-to-valve seal clearance. Torque all head hardware to OEM or builder-specified values. This kit is typically installed as part of a full engine rebuild or head refresh alongside aftermarket camshafts, retainers, and valve seals.

Is this kit compatible with aftermarket camshafts? Yes — the Supertech SPT dual spring kit is designed to support performance camshaft profiles with increased lift and duration beyond OEM specs, making it an ideal pairing with popular RB25 aftermarket cam upgrades.

Does this require a solid lifter conversion? Yes — this kit is specifically engineered for RB25 engines running solid (mechanical) lifters. Hydraulic lifter engines will require conversion prior to installation.