Spring Kit - .675" - Evolution/Twin Cam
Stainless steel conversion kit includes only what's needed to convert your head to the long-life stainless steel Black Diamond™ intake valves
Extend the life of the valvetrain and intake components by as much as 4x over the OEM titanium parts
Includes forged one-piece stainless steel intake valves, wound chrome-silicon heat-treated wire valve springs, ultra-light titanium retainers and hardened steel bases
Components are created using Finite Element Analysis (F.E.A.) software, as well as proprietary camshaft analysis and spring design software
Specifically designed and engineered for each application
Made in the U.S.A.