Valve guide sleeving.
 

Hi all, just wondered if anyone out there has experience of valve guide wear repaired with sleeves rather than complete new guides. My machine shop is keen to promote them for various reasons, no stress on head when pulling and pushing new full guides in and better alignment with the valve seat, better lubrication too. I’m not sure about longevity or wear etc, has any one had any experience? Comments welcomed.

You're likely to get crickets chirping waiting for a response.

Replacing valve guides in the air cooled cars is pretty straightforward and time tested. And they're cheap, like under $6 each if you shop around. Any alignment problem is corrected when you clean up the valve seat angles. As far as better lubrication from a sleeve, that's debatable. Phosphorus bronze guides have worked pretty well for quite a long time, although there are other materials available.

guide inserts
 

I have seen them done for years in iron heads on V8 cars and it's an acceptable method for doing them, 911 heads I have seen a few and I would not do it that way.
Mike Bruns

There's no stress on the head when correctly done with the right tools - i.e. the tools you are NOT likely to have in your garage....