Supertech Performance SPRK-H1021D-ST Dual Valve Spring Kit

The Supertech Performance SPRK-H1021D-ST is a precision-matched dual valve spring and retainer kit designed for complete valvetrain overhaul on Honda F20/K20 and Acura K-series engines. This comprehensive kit delivers the performance, quality, and reliability demanded by serious enthusiasts and engine builders.

Premium Construction:

• Dual valve springs manufactured from premium Superclean Chrome Silicon Vanadium steel alloy for exceptional durability at high RPM ranges
• Computer-designed spring geometry ensures smooth harmonics and controlled stress levels to prevent fatigue under extreme conditions
• Titanium retainers reduce reciprocating mass for improved valve control and higher RPM capability
• Includes valve seat locators for proper installation and sealing

Technical Specifications:

• Seat pressure: 95 lbs @ 40.4mm installed height
• Open pressure: 261 lbs @ 12mm
• Maximum net lift: 17.7mm
• Coil bind: 22.7mm
• Spring rate: 13.2 lbs/mm
• Outer spring: 30mm OD / 21.8mm ID
• Inner spring: 21.3mm OD / 15.5mm ID

Complete Kit Includes:

• 16 dual valve springs (SPR-H1021D)
• 16 titanium retainers (RET-K20A2/T2)
• 16 valve seat locators (SEAT-H1020DS)

Supertech applies over 30 years of experience and state-of-the-art testing equipment including ultrasonic tests, x-rays, laser measurement, and computerized Finite Element Analysis (FEA) to ensure industry-leading performance and quality. Each component features strict dimensional tolerances for superior sealing, reliable performance, and easier installation compared to competitor products.