sunk valves, stem height problem

Care must be taking here. The tips should be ground on a Serdi valve surfacer and no more than .015" taken off. After that a chamfer must be redone so as not to tear up the guide on assembly. Also too much removal will effect the fit of the valve locks and retainers. I believe the installed height of valve is 1.56" - 1.59" but I.m not sure. Engine builders call it 1.60" height but I don't know why.