Well I phoned this guy at Manley because I never recieved the email I was supposed to recieve long time ago.
So basically he told me around 100000 possible reasons why the valve broke and none of them has to do with the valve itself.
1.- Bad seat angle
2.- Bad alignment
3.- Spring misspreasure
4.- Not a good guide
5.- blah blah blah blah
so anyway, I never expected to get anything replaced from them because we all know how this type of issues end when theres a big company involved.
(most of the time...)
He even asked me if I wanted back the valves I sent them to check but I should be paying for shipping ...
I´m done with Manley stuff, and anyone planing in buying stuff from them, all I have to say is good luck.