The most reasonably priced component used on the Kx450-d8f Kx450f 2008 Usa Valve(s) is the Seat-spring.
The Valve(s) is made up of components including this Valve-exhaust which is the most expensive.
Parts such as the Valve(s): Shim,t=2.35, Shim,t=2.25, Spring-engine Valve,e, Shim,t=2.40 are included in the Kx450-d8f Kx450f 2008 Usa Valve(s) parts fiche.