Stock valves in iron heads question

When you say "Small Mechanical Roller".... just what kind of Valve Spring Installed Seat Pressure & Spring Rates are called for by the Cam Card ?
remember,
Valve "Bounce" on the seat is caused by insufficient Valve Spring Pressure or Rate to keep up with the Cam.... is what knocks the Valve "Head" off the Valve "Stem" on a 2 pc stock Valve.
With sufficient Valve Spring for the Cam.... even the cheapest Valves will live.