If you Install them with the Right tool AND what some guys call a (condom lol)Which is a sleeve for valve You will not rip the seals.The seals are installed after the valve is in the Head.Once the valve is sitting in the head you then put on the sleeve and Then Install the SEAL.Yes the valve guide boss does need to be cut for the seals.If for what ever reason you cut/rip the top of the seal You need to install a NEW ONE.
Once the seals have been installed and for what ever reason You have to put the valve Out,You
will end up cutting the top of the seal out and a NEW one is again needed.
God doesn't like ugly.
