The component with the lowest price in the CAMSHAFT/VALVE schematic is the Cotter,valve.
With thirty-two applications this Cotter,valve is the most specified part.
Some items from this specific schematic: Shim,tappet (2.67, Shim,tappet (2.80, Shim,tappet (1.20, Shim,tappet (1.55.