Can Titanium Valves Be Lapped?

Do not touch the valve surface with your bare hands - Use gloves or pre-lube the valve with engine oil (this will reduce the risk of corroding the coating). Never use a lapping compound on a titanium valve.

Can titanium valves be refaced?

I would not advise doing it . Most ti valves have a treatment or coating that will be ruined if you grind them . We don't even lap in with new valves where I work. We use a stainless or a new ti valve that will never go in a motor for lapping.

Do brand new valves need lapped?

New seats, with new valves should require no lapping to get a good seal - my machinist refuses to lap in the first place, considering it to be a half-baked solution.