Hi Fred,
  All valve guides need to be reamed to the proper size after they are
pressed in the head, not just bronze guides.  One firther comment: 
Some  machins shops don't do bronze guides because they need a different
type of reamer than that for steel guides.
  My .02,
  CR
Fred Pixley wrote:
> 
> Matt:
> 
> Further to the cylinder head discussion I found that bronze guides are fine
> but you must ream them to the proper dimension after installation to prevent
> the valve stem from binding.
> 
>
> Fred Pixley
> Napanee, Ontario, Canada
 
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