Changing Valve Guides

[Douglas Braun & Nadia Papakonstantinou <dougnad@bellatlantic.net>]

Hello,

Is it practical to replace valve guides at home,
or is this a job that I would be better off
having a machine shop do?  Would I need a special
tool, or would I able to make a useable puller
tool from threaded rod, some nuts, and a bit of
steel plate?

Also, the head I am working on does not seem
to have valve seat inserts.  Does anyone
know when Triumph started using them?

Thanks,

Doug Braun