GSC Power Division 5074 Dual Conical Valve Spring Kit for 02-21 Subaru EJ WRX ST

Vehicle Fitment

• 2002-2014 Subaru WRX (EJ20 / EJ25 Turbo, AWD)
• 2004-2021 Subaru WRX STI (EJ257, EJ25 Turbo, AWD)

Fitment Notes

• Designed specifically for Subaru EJ-series turbocharged engines
• Compatible with high-lift camshaft configurations
• Requires professional installation and valvetrain setup
• Recommended for built or high-boost performance engines only

Features

• Dual conical spring design for superior valve control stability
• Reduces valve float at extreme RPM conditions
• Rated for up to 10,000 RPM high-performance builds
• Supports boost levels up to approximately 40 psi
• Titanium retainers reduce valvetrain rotating mass
• Chromoly spring seats improve durability and alignment
• Improved harmonic damping under high load conditions
• Optimized for turbocharged Subaru EJ engine platforms

Specifications

• Part Number: 5074
• Brand: GSC Power Division
• Type: Dual Conical Valve Spring Kit
• Engine Platform: Subaru EJ20 / EJ25 / EJ257
• Seat Pressure: ~95 lbs
• Open Pressure: ~233 lbs @ 11.5 mm lift
• Max Valve Lift: ~0.512 in
• Coil Bind: ~0.790 in
• Max RPM: Up to 10,000 RPM
• Position: Cylinder Head Valvetrain

Included Components

• 16x Dual Conical Valve Springs
• 16x Titanium Retainers
• 16x Chromoly Valve Spring Seats

Product Description

The GSC Power Division 5074 dual conical valve spring kit is engineered for Subaru EJ-series engines including WRX and STI turbo platforms. Designed for extreme performance applications, this kit provides the valvetrain stability required for high-boost and high-RPM builds where factory components would fail under stress.

Featuring dual conical springs with titanium retainers and chromoly seats, the system significantly reduces valve float while improving durability and harmonic control. It is built to support aggressive camshaft profiles, increased boost pressure, and sustained high engine speeds up to 10,000 RPM.

This kit is intended for serious performance builds, including track, drag, and high-power street applications. Professional installation is strongly recommended to ensure correct setup, valve geometry alignment, and long-term reliability under extreme operating conditions.