>I've seen this done with valve seats in engines too.  Expand the head
>with a torch and shrink the seats with dry ice.  Seats drop in easily,
>and once everything gets to the same temperature, the seats are locked
>in.

Now that's a good idea.  We routinely use dry ice in our lab, and I believe
it would be far easier to use the dry ice to reduce the pin than a heat gun
to expand the work.

Thanks!

Mike H.

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