Shimless Conical Valve Spring Kit – Nissan RB26DETT - GSC5085
High RPM Valvetrain Stability for RB26 Builds
The GSC5085 Shimless Conical Valve Spring Kit is engineered for the legendary Nissan RB26DETT platform. This complete kit includes 24 conical valve springs, 24 titanium retainers, 12 chromoly intake seats, and 12 chromoly exhaust seats—designed to handle elevated boost pressures and aggressive cam profiles with precision and reliability.
Performance Specs
- Seat Pressure: 95 lbs @ 1.285" install height
- Open Pressure: 225 lbs @ 0.862" lift (10mm)
- Maximum Valve Lift: 0.443"
- Coil Bind: 0.786"
- Max RPM: 10,000 RPM
- Max Boost: 50 psi
- Total Spring + Retainer Weight: 38 grams
Why Conical Springs Lead in Harmonic Control
Conical springs utilize variable coil diameter and spacing to naturally dampen valvetrain harmonics—reducing shock, minimizing wear, and extending component life. Compared to cylindrical or beehive designs, conical springs offer superior harmonic stability, making them ideal for engines pushed to the edge by aftermarket tuning.
Built for Longevity and Performance
Each spring undergoes a multi-step heat treatment and features a super-finished surface for enhanced durability and consistent performance. Whether you're chasing higher RPMs or dialing in more boost, this kit is built to keep your RB26 valvetrain in check.
Fitment:
- 1989–1994 Nissan Skyline GT-R R32 2.6L Twin Turbo
- 1995–1998 Nissan Skyline GT-R R33 2.6L Twin Turbo
- 1999–2002 Nissan Skyline GT-R R34 2.6L Twin Turbo
- Compatible with RB26DETT engine builds using shimless bucket conversion
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
