The component with the lowest price in the RIGHT CYLINDER HEAD schematic is the Screw,cross 5x8.
The sub assemblies and components that make up this Right Cylinder Head include this Head,r,cylinder, the most expensive part.
Some items from this specific schematic: Screw,pan,5x20, Ins,r,carburetor, Bolt,flange,6x22, Stud, 6x55.