The Supertech Dual Valve Spring & Titanium Retainer Kit (SPRK-H1000D-K20TI) is a precision-engineered performance valvetrain upgrade designed for compatible Honda and Acura K-Series cylinder heads equipped with titanium valves. Featuring Supertech's H1000D dual valve springs, lightweight titanium retainers, and matched spring seat locators, this kit provides the spring control and valvetrain stability required for demanding high-performance engine applications.

Engineered specifically for titanium valve configurations, the SPRK-H1000D-K20TI kit features a carefully selected spring pressure profile designed to support proper valve control without the unnecessarily high seat pressure associated with some more aggressive racing spring packages.

With a manufacturer-specified 60 lb seat pressure at 37mm installed height and 203 lb open pressure at 12.5mm compressed height, this dual spring assembly is designed to maintain consistent valve operation while accommodating up to 16.3mm of maximum net valve lift, subject to proper installation and clearance verification.

The dual spring configuration uses an outer and inner spring working together to provide controlled valve movement and improved resistance to undesirable spring harmonics. This helps maintain stable valvetrain operation during elevated engine speeds and demanding performance conditions.

Complementing the springs are Supertech titanium retainers, which help reduce reciprocating valvetrain mass compared with conventional steel retainers. Reduced valvetrain weight can improve the ability of the spring assembly to control valve movement, particularly in performance engines operating at elevated RPM.

Whether assembling a naturally aspirated K20 race engine, building a high-performance K24 cylinder head, or developing a K20/K24 hybrid combination with titanium valves, the Supertech SPRK-H1000D-K20TI offers a matched valvetrain solution for performance-focused engine builders.

Features

• Dual Valve Spring Construction: Uses concentric inner and outer springs to provide controlled valve movement and improved spring stability.

• Designed for Titanium Valves: Specifically configured for compatible K-Series cylinder heads equipped with titanium engine valves.

• 60 LB Seat Pressure: Manufacturer-specified seat pressure of 60 lb at a 37mm installed height.

• 203 LB Open Pressure: Provides 203 lb of spring pressure at a 12.5mm compressed height.

• 16.3mm Maximum Net Valve Lift: Supports compatible high-lift camshaft configurations when all required clearances are verified.

• Lightweight Titanium Retainers: Help reduce reciprocating valvetrain mass for improved valve control.

• Matched Spring Seat Locators: Provide proper positioning and support for the dual valve spring assemblies.

• Performance-Oriented Spring Design: Engineered to provide consistent spring operation under demanding conditions.

• Improved Valvetrain Stability: Helps control valve movement during high-RPM operation.

• Reduced Spring Harmonics: Dual spring configuration helps manage unwanted spring oscillation.

• Precision-Matched Components: Springs, retainers, and seat locators are selected to work together as a complete assembly.

• High-Performance Camshaft Compatibility: Suitable for properly engineered performance camshaft and titanium valve combinations.

• Naturally Aspirated and Forced-Induction Applications: Can be incorporated into compatible engine builds when spring pressures meet the engine's requirements.

• Professional Engine Builder Solution: Designed for performance cylinder head assembly and valvetrain upgrades.

Popular Performance Applications

• Honda K20 Performance Builds: Provides a performance valvetrain solution for compatible K20 cylinder heads using titanium valves.

• Honda K24 Performance Builds: Suitable for compatible K24 cylinder head configurations with the required spring and retainer geometry.

• K20/K24 Hybrid Builds: Supports performance-oriented hybrid engines using compatible K-Series cylinder heads and titanium valves.

• Naturally Aspirated Racing Engines: Helps maintain consistent valve operation in properly configured high-RPM engines.

• Performance Camshaft Upgrades: Can be paired with compatible aftermarket camshafts requiring the specified spring pressure and lift capability.

• Track and Road Racing Applications: Provides improved valvetrain control for demanding motorsport conditions.

• Drag Racing Builds: Supports performance engine combinations requiring reliable valve spring operation during aggressive acceleration.

• Cylinder Head Rebuilds: Provides a matched spring and retainer upgrade when installing compatible titanium valves.

• Lightweight Valvetrain Builds: Titanium retainers complement titanium engine valves to help reduce reciprocating valvetrain mass.

• Built K-Series Engines: Suitable for professionally engineered engine combinations where the specified spring characteristics match the intended operating conditions.

Additional Information

• Manufacturer: Supertech Performance
• Part Number: SPRK-H1000D-K20TI
• Product Type: Dual Valve Spring and Titanium Retainer Kit
• Engine Family: Honda/Acura K-Series
• Valve Compatibility: Titanium Valves
• Valve Spring Configuration: Dual Spring
• Valve Spring Part Number: SPR-H1000D
• Titanium Retainer Part Number: RET-K20A2/T2
• Spring Seat Locator Part Number: SEAT-H1020DS

Valve Spring Specifications:

• Seat Pressure: 60 lb at 37.0mm

• Open Pressure: 203 lb at 12.5mm compressed height

• Maximum Net Valve Lift: 16.3mm

• Coil Bind Height: 20.7mm

• Spring Rate: 11.5 lb/mm

• Outer Spring Outside Diameter: 29.65mm

• Outer Spring Inside Diameter: 21.85mm

• Inner Spring Outside Diameter: 20.50mm

• Inner Spring Inside Diameter: 15.50mm

Engine Applications:

• Compatible Honda K20 cylinder heads

• Compatible Honda K24 cylinder heads

• Compatible K20/K24 hybrid engine combinations

• Performance K-Series cylinder heads configured for titanium valves

Important Fitment Information:

This spring kit is specifically listed by Supertech for use with titanium valves. It should not be treated as a universal replacement for every K20 or K24 cylinder head or for factory steel valves.

Compatibility depends on the cylinder head, valve length, valve stem and keeper configuration, installed height, camshaft lift, and retainer-to-seal clearance. Verify these specifications before installation.

Important: Maximum net lift is a manufacturer-specified spring characteristic and does not guarantee that every cylinder head or camshaft combination can safely operate at that lift. Actual allowable lift must be determined through proper engine assembly measurements.

Common Reasons for Replacement

• Titanium Valve Installation: Provides a spring and retainer configuration specifically intended for compatible titanium valves.

• High-RPM Valvetrain Upgrades: Helps maintain proper valve control during elevated engine speeds.

• Performance Camshaft Installation: Supports compatible camshaft profiles requiring upgraded valve springs.

• Valve Float Concerns: Properly matched spring pressure can help reduce the risk of uncontrolled valve movement.

• Cylinder Head Performance Builds: Provides a matched set of valvetrain components for professional engine assembly.

• Reduced Valvetrain Weight: Titanium retainers help reduce reciprocating mass compared with conventional steel components.

• Worn Factory Valve Springs: Replaces fatigued or unsuitable springs during a performance engine rebuild.

• Racing Engine Preparation: Supports demanding operating conditions when correctly matched to the engine combination.

• Valvetrain Reliability Upgrades: Helps maintain consistent valve motion and spring control in properly configured applications.

• Complete Cylinder Head Rebuilds: Provides a coordinated spring, retainer, and seat locator solution for compatible K-Series heads.

Installation Notes

1. Verify Cylinder Head Compatibility: Confirm that the K-Series cylinder head, titanium valves, and valve keeper configuration are compatible with Supertech part number SPRK-H1000D-K20TI.

2. Confirm Titanium Valve Requirements: This kit is intended for titanium valve applications. Verify valve manufacturer recommendations before installation.

3. Inspect Existing Valvetrain Components: Check the valve guides, valve seats, valve seals, keepers, and related components for wear or damage.

4. Remove the Existing Valve Springs: Use an appropriate valve spring compressor to safely remove the original retainers, keepers, and springs.

5. Inspect the Spring Seats: Ensure the cylinder head spring pockets are clean and free of damage.

6. Install the Matched Seat Locators: Position the Supertech spring seat locators according to the manufacturer's instructions.

7. Measure Installed Height: Verify the installed height of each valve spring assembly using the appropriate measuring tools.

8. Check Spring Pressure: Confirm that the installed spring pressure matches the requirements of the selected camshaft and titanium valve combination.

9. Install the Dual Valve Springs: Ensure the inner and outer springs are correctly positioned and fully seated.

10. Install the Titanium Retainers: Use the specified Supertech retainers and compatible valve keepers.

11. Verify Keeper Engagement: Confirm that the retainers and keepers are properly seated and securely retain each valve.

12. Check Coil Bind Clearance: Measure spring compression at maximum valve lift and verify adequate clearance before operating the engine.

13. Verify Retainer-to-Seal Clearance: Confirm sufficient clearance between the retainer and valve stem seal or guide at maximum lift.

14. Inspect Camshaft Compatibility: Verify that the selected camshaft lift, duration, and operating RPM are appropriate for the spring package.

15. Check Valve-to-Piston Clearance: Measure clearance when using aftermarket camshafts, modified cylinder heads, or altered compression ratios.

16. Verify Valvetrain Operation: Rotate the engine manually and inspect the completed assembly before initial startup.

17. Professional Installation Recommended: Installation by an experienced engine builder or cylinder head specialist is strongly recommended.

Important: Incorrect installed height, insufficient coil bind clearance, incompatible retainers, or improper valve keeper selection can cause severe engine damage. Always measure and verify the complete valvetrain assembly before operation.

What's Included

• (16) Supertech H1000D Dual Valve Spring Assemblies

• (16) Supertech Titanium Valve Spring Retainers

• (16) Matching Spring Seat Locators

Note: Each dual spring assembly consists of an inner and outer spring, providing 32 individual spring elements for a 16-valve cylinder head.

Titanium engine valves, valve keepers, valve stem seals, camshafts, and other cylinder head components are not included unless specifically stated by the manufacturer.

Upgrade your Honda or Acura K-Series cylinder head with the Supertech Dual Valve Spring & Titanium Retainer Kit (SPRK-H1000D-K20TI) for precision-engineered valve control, reduced valvetrain mass, and dependable high-performance operation.

Featuring Supertech H1000D dual valve springs, lightweight titanium retainers, and matched spring seat locators, this kit delivers 60 lb seat pressure, 203 lb open pressure, and up to 16.3mm maximum net valve lift for compatible titanium valve applications.

Whether you're building a high-RPM K20, assembling a performance K24, or upgrading a K20/K24 hybrid cylinder head, Supertech provides the quality, precision, and valvetrain engineering needed to support your next performance build.