GSC Dual Cylindrical Valve Spring Kit WRX 15-21 / BRZ / FR-S / 86 13-20 | 5256

Product Fitment:

2015-2021 Subaru WRX

2013-2016 Scion FR-S

2013-2020 Subaru BRZ

2017-2020 Toyota 86

The GSC Power-Division Dual Valve Spring Kit for the FA20 engine offers a serious valvetrain upgrade for enthusiasts building high-revs or high-boost applications. Engineered for strength, precision, and endurance, this kit features dual concentric springs with high seat pressure and matching titanium retainers for maximum reliability.

Key Features:

• Twin (dual) valve spring construction designed to resist float and maintain control at extreme RPMs.

• Approximate seat pressures: ~102 lbs (IN) @ 1.299″ install height and ~100 lbs (EX) @ 1.303″ install height.

• Maximum RPM rating: ~9,500; Max boost capacity: ~50 psi depending on build.

• Includes titanium retainers, spring seats, and all required components for installation.
  

Why Choose This Kit?
If your FA20 build is seeing higher RPMs, aggressive cam profiles, forced induction, or increased boost, the factory valve springs may become a limiting factor. This GSC kit delivers stronger spring force, better fatigue resistance, and improved control under load — enabling your engine to perform consistently without valve float, bounce, or failure.

Installation & Fitment Notes:

• Requires full valvetrain accessibility; removal of camshafts and valve covers necessary.

• After installation, perform proper valve clearance, spring seat checks, and retainer inspection.

• Recommended for engines running high RPM or forced induction setups.