[FL911]

There may be a post on this and if so please let me know.
My question is ...... my machinist is finally working on my heads of off my 81 911SC and the new valve quides that I ordered I believe where the first oversize guides that were offered.
Anyway...my machinist says the guides are way too tight to press into the heads so he is going to have to do some machinist engineering to get them to fit.

My questions are ...
1. Did I purchase the wrong quides which are the first oversize? Is there other guides sizes other than the first and second oversize such as OEM size?

2. If the guides I bought are the correct ones, what is the process for installing them? It does not seem normal to me for a machinist to have to modify the guides in order to install them.......or I may be in left field?

Any information regarding this process or my mistake by getting the wrong guides?

I just want some input to "speed things up" at the machine shop so I can drive the car!!!!!!!!!!

Thanks,
Frank