Valve guide question

I'm a little different than perfcar - I want the valve job done before I do any hand porting. That's because I have a 5 angle job done which really reduces the amount of grinding and it gives me the opportunity to not get too near the seat angles and mess something up. The guides have to be done prior to any valve/seat work that is done as part of the valve job, and because they were knurled - they may not be able to use liners. So have them carefully checked before you invest anything in them.