I know, I havent even said Manley is a bad brand to go with, but like I said now I know of another person who had the same problem as I did and therefore same results as far as engine damage goes, and thats only from talking about it in 2 forums.Mex, I know you had a bad experience and I am really sorry - seriously.
However, the fact remains that manley is still an awesome valve that is tried and proven. I'm still not convinced your valve was at fault in your case either.
However, it does suck what happened to you but it's not fair to give manley valves a bad wrap cause they are a good valve overall IMO.
To the poster - you can use limiters or lockouts. Limiters will do the job for you but the lockouts are cheaper... your call.