A valve job meant decarboning and refinishing the portion of the valves that seats (seals) against the port openings, and resurfacing the openings. If the valves were burned or damaged, they were replaced.
It also meant checking the health of the springs (they get weak over time and can be tested for length and strength), replacing the valve stem seals, and cleaning and inspecting and replacing as necessary the other parts such as lifters, rockers, and even the bushings on the rocker arm shafts.
In addition, the head needed to be removed to do a valve job, so the head itself was cleaned and checked for flatness and damage, and machined if necessary. Typically, carbon buildup was mechanically cleaned from the piston tops if necessary.
And of course the headgasket was replaced upon reinstallation. And the valvelash was readjusted.
Valve tapping means the valve lash needs adjustment. The valve lash is the “free play” in the chain of parts from the cam lobe to the valve.
Today a valve job on an engine with the cam in the block would be the same. On an overhead cm engine, it would include checking the camshaft as well as the components in the system that drives the camshaft, whether they’re belt or chain. Since this string of components also has to be disassembled to get the head off, the front of the engine has to come apart. Everything there gets checked as well.
Some still use cams in the blocks.
Guys, did I miss anything?