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Do not remove head unless necessary.
Check compression with simple sparkplug hole compression gauge.
If compression is good, leave it alone.

If compression is bad, there are 2 different machine shop concerns.

One is if flat or warped?
That is rare, but a warped head has to be milled flat again.
But can only be done once, so never done unnecessarily.

The second is to machine the valve seats that have become worn and pounded by valves, to no longer be flat 45 degree cone shaped. The valve seats have to be reamed concentric and smooth.
Valve guides sometimes also need replacing.
Not so much these days though.
Valves themselves often just replaced.
Especially exhaust valves.
 

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We are talking about engines that have been around the block a few times. It's hard pressed to believe the head would not need to be skimmed. Not because it's warped but because there are imperfections on the surface. There seems to always be some places of corrosion. At least, that is what I have experienced. Plus, cleaning the surface is so much easier after a freshly machined surface.

If you elect to remove the head, for whatever reason, I would look into the PG headgasket. Those all metal gaskets seem to be the best way to seal the head and they are certainly more of a lifetime gasket than the ones VW originally put on our engines.
Disagree.
Since you can only mill once, you don't ever do unless badly warped.
Imperfections are not a problem, as they do not run any length that would allow compression to escape.
 
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