GSC Power-Division Conical Valve Spring with Ti Retainer and Seat for the Toyota G16E-GTS 2020+ GR Yaris / 2023+ GR Corolla - GSC5017 Details: GSC Power-Division Conical Valve Spring Kit with Ti Retainer for the Toyota G16E-GTS found in the GR Yaris and GR Corolla 107 lbs @ 1.310" install height 263lbs @ 0.838" (12mm Valve Lift) GSC5017 Conical Valve Spring Kit with Ti Retainer for Toyota G16E-GTS Setup Coil Bind (in) Install Height (in) Seat Pressure (lbs) Open Pressure, 12.0mm Lift Maximum Valve Lift (in) Conical .787 1.310 107 263lbs @ 0.838" 0.472 Max RPM: 10,000 RPM Max boost: 60 psi The GSC Power-Division Conical Valve Spring Kit with Ti Retainer for the Toyota G16E-GTS for the GR Yaris and Corolla includes 12 titanium retainers (6 Intake and 6 Exhaust) and 12 Conical valve springs and 12 new Spring Seats. True conical valve springs aren’t a new concept—they’ve been proven in the industry to offer several key advantages over traditional spring designs. One of the biggest benefits of conical springs compared to traditional cylindrical or beehive springs is their ability to dampen and eliminate valvetrain harmonics. Out of the three designs, conical springs lead the way in maintaining valvetrain harmonic stability. Thanks to their varying coil diameter and spacing, conical springs act as natural harmonic dampers, absorbing the shock in the valvetrain. This means less stress, less wear, and a longer life for your engine components. This level of protection is essential for today’s engines, which are being pushed to their physical and mechanical limits. Every GSC conical spring undergoes a super-finished surface treatment in addition to a patented, multi-step heat treatment process. The result? A super reliable, high-performance spring that lets you push higher RPMs and use more aggressive cam profiles with confidence. If you’re looking to get the most out of your engine, GSC conical springs are the way to go. They’re built to perform, engineered to last, and designed to let you take your engine to the next level.