Supertech Valve Spring Kit – Honda Civic Type R (FK8/FL5) – K20C1

Supertech Single Valve Spring Kit – Honda K20C1 (SPRK-K20C-1)

The Supertech SPRK-K20C-1 Single Valve Spring Kit is designed to meet the rigorous demands of high-performance and forced induction Honda K20C1 engines, including the FK8 and FL5 Civic Type R. With increased seat and open pressures, this kit delivers excellent valve control at high RPM, making it ideal for aggressive street or track builds.

Key Features

• Single beehive-style valve springs designed for high-RPM stability
• Enhanced seat and open pressures for improved valve control under boost
• Precision-machined retainers and seat locators for optimal fitment
• Compatible with factory-style valvetrain setups

Spring Specifications

• Seat Pressure: 77 lbs @ 40.60mm
• Open Pressure: 176 lbs @ 10mm lift
• Max Valve Lift: 13.80mm
• Coil Bind Height: 27.30mm
• Spring Rate: 9.9 lbs/mm

Kit Contents

• Springs (Part No. SPR-H1003S) x16
• Tool Steel Retainers (RET-1003-C) x16
• Seat Locators (SEAT-1003-CI / SEAT-1003-CE) x16

Spring Dimensions

• Outer Spring Inner Diameter: 16.30mm
• Outer Spring Outer Diameter: 23.70mm

Vehicle Compatibility

• Honda Civic Type R FK8 (2017–2021)
• Honda Civic Type R FL5 (2023+)