The Cylinder Head assembly is constructed from several parts from which the Head-comp-cylinder is the most expensive.
Some items from this specific schematic: Pin,dowel,6.2x8x14, Bolt,6x40, Bolt-flanged,6x45, Washer,10.5x19x2.3.
The Pin,dowel,6.2x8x14 is the cheapest item from this partsfiche.