Single Valve Spring Kit

The GSC Power-Division GSC5756 is a single valve spring kit engineered for the Subaru BRZ, Scion FR-S, and Toyota 86 models equipped with the FA20D/4U-GSE engine. Crafted with meticulous attention to detail, these round wire springs maintain GSC's reputation for excellence. Each spring is Nano-peened for enhanced durability and precisely batched according to its seat pressure, ensuring consistency within GSC specifications. The accompanying titanium retainers are CNC machined to exacting tolerances, offering unmatched repeatability and contributing to a uniform seat pressure across the cylinder head for optimal reliability and performance. Key specifications for this kit include an intake seat pressure of 89 lbs at 1.279" install height and exhaust seat pressure of 88 lbs at 1.283". At 0.846" install height, the intake open pressure reaches 182 lbs, while the exhaust measures 181 lbs at 0.850". The springs are rated for a maximum valve lift of 0.433" and can support up to 8,200 RPM and 20 psi of boost. This valve spring kit is compatible with the 2013+ Subaru BRZ, 2013+ Scion FR-S, and 2017+ Toyota 86. Installation of high-performance camshafts and associated valvetrain components should always be performed by an experienced, SAE-certified mechanic or a skilled high-performance engine builder to ensure proper function and longevity.