How to chuck up engine valve and turn down stem .010quot; by
Dec 27, 2019#0183;#32;I have done this a couple times for old motorcycles, Thors. I used new valves, Pontiac 428 was closest fit. The retainer ends are much harder than the stem section. In this case the ends needed to be threaded, Grinding the stems was done in a CG, but could be done with a TP grinder.