GSC5087 High Boost Conical Valve Spring Kit – Nissan TB48
Built for Boosted TB48 Engines Pushing the Limits
The GSC5087 Conical Valve Spring Kit is engineered for high-output Nissan TB48 builds running elevated boost and RPM. This complete kit includes 24 conical valve springs, 24 titanium retainers, and 24 chromoly spring seats, delivering unmatched valvetrain control under extreme conditions.
Performance Specs
- Seat Pressure: 132 lbs @ 1.330" install height
- Open Pressure: 288 lbs @ 0.858" lift (12.0mm)
- Maximum Valve Lift: 0.473"
- Coil Bind: 0.793"
- Max RPM: 10,000 RPM
- Max Boost: 60 psi
Why Conical Springs Dominate in Harmonic Control
Conical springs feature variable coil diameter and spacing, acting as natural harmonic dampers. This design reduces valvetrain shock, minimizes wear, and extends component life—especially critical in engines pushed to their mechanical limits by aftermarket tuning.
Durability Meets Precision
Each spring undergoes a multi-step heat treatment and is finished with a super-smooth surface for consistent performance and long-term reliability. Whether you're chasing RPMs or dialing in high boost, this kit is built to keep your TB48 valvetrain stable and responsive.
Fitment:
- 2002-2022 Nissan Patrol Y61 4.8L TB48DE
- Nissan Safari TB48DE (Middle East / Australia Spec)
- Compatible with TB48DE engine builds using high boost and aggressive cam profiles
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