8 to 10 hrs labor to change '225' head gasket ?????

Johnny Dart said

Working on the intake/exhaust studs on a slant this old can be iffy.
Studs have been known to snap frequently. Once one snaps,it sucks removing them. Soaking them with your favorite penetrator is a must.

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Yep,, but if they break anyway,, it isn't the mechanics fault.. he has no way of knowing if the nut is undoing, or if the studs twisting off..

On a different note, Champion has a good read about who's fault it is if a plug breaks off undoing it..