When I changed my timing chain the chain slipped and I could tell I did not get it back in the right place at first while turning over by hand. The amount of torque needed to turn my 560 was not much until the slip. After I had the chain fed all the way through I had one extra link.

As long as you did not over do it your valves should be. How do you know you are only off one tooth??? If you have the intake off you could turn it over with the starter and feel by hand if you have any pressure at the intake side. For the exaust side I would think a compression check would show it unless you think both sides are bad.

As M.B.Doc said if you really want to know if one tooth would do it you should post what motor you are asking about.

I believe for my 560 it takes 16deg to bend a valve. one tooth is 13 degrees. My timing chain had stretched 11deg at 100k miles.