The way to adjust valve lash is different between the two. The questions I have is How to distinguish a car is mechanical lift or hydraulic lift? Say, if I don‘t know the year of the engine.
Most mechanical lift engines have adjustable tappets although some hydraulic do also. If the engine is from 1980 on up, assume its hydraulic.
If you could be more specific about what make of engine you are referring to I can probably help out. Thanks
