GSC Power-Division 5066 Conical High-Pressure Valve Spring Kit for Toyota 2JZ-GT

Vehicle Fitment

• 1993-2002 Toyota Supra Turbo (3.0L 2JZ-GTE)
• 1991-1997 Toyota Aristo/LEXUS GS300 (3.0L 2JZ-GTE, Japan)*

Features

• High-pressure conical valve spring design for superior performance
• Titanium retainers reduce valvetrain mass for faster response
• Enhanced harmonic damping for reduced spring surge
• Designed for high RPM and aggressive cam profiles
• Improved control at boost pressures up to ~60 psi
• High-quality patented multi-step heat treatment process
• Superfinished spring surface for durability and long life
• Direct OEM-style replacement for 2JZ-GTE valvetrain upgrades

Specifications

• Part Number: 5066
• Spring Type: High-Pressure Conical Valve Springs
• Install Height: ~1.316" (2JZ-GTE)
• Seat Pressure: ~105 lbs
• Open Pressure: ~253 lbs @ .869" lift
• Coil Bind: ~0.818"
• Max RPM Capability: ~10,000 RPM
• Max Boost Support: ~60 psi

Included Components

• 24x Conical Valve Springs
• 24x Titanium Retainers

Product Description

The GSC Power-Division 5066 Conical High-Pressure Valve Spring Kit is engineered to enhance the valvetrain performance of the legendary Toyota 2JZ-GTE engine used in the Supra Turbo and select Aristo/GS300 models. Featuring advanced conical spring geometry and lightweight titanium retainers, this kit provides superior harmonic damping and improved valve control under high RPM and high boost conditions - allowing engines to handle aggressive cam profiles and sustained high-load operation with confidence.

With capability up to approximately 10,000 RPM and support for boost pressures near 60 psi, the 5066 kit is ideal for track builds, high-boost street cars, and other performance applications where valvetrain stability and durability are critical. Precision heat-treated and superfinished components ensure consistent performance and long service life, while direct fitment makes installation straightforward during engine rebuild or upgrade projects.