The most reasonably priced component used on the Civic 1999 (x) 4dr Ex (ka) Cylinder Head (vtec) is the Dowel,pin,8x14.
The Cylinder Head (vtec) assembly is constructed from several parts from which the Head Assy,cyln is the most expensive.
Some items from this specific schematic: Bolt,stud,2 8x25, Head Assy,cyln, Seal B,valve Stem, Guide In Valve (0sz).