This high quality high lift spring kit is a must when using any of our high performance cams (TC-4G, TC-46G, TC-5G, TC-26G, TC-546G, ER-2, or ER-46) on '84-'99 Evolution or '99-'04 Twin Cam engines.

• Titanium top retainer
• Interference wound double springs with damper
• For use with cams up to .640” lift
• 180 lb. seat pressure
• Can be used in '05-later engines if valves and guides have been converted to 5/16" diameter