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Skimming heads also raises an interesting issue with OHC engines. If a head is skimmed to bring it back to flat after warping then presumably the camshaft bearings no longer align causing excess load on the camshaft and wear in the bearings. Would it not be preferable to have a slighty warped head pulled down flat with the head bolts than have it machined such that the camsaft bearings no longer align? Just food for thought.
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As others have said.
I would definetely check the head for cracks, valve seating quaility, and surface flatness/condition.
Surfacing a warped OHC head can be a problem. A head doesn't typically warp under normal operating conditions though, so if it is then more work needs to be done to the head.
Some machine shops have the capability to straighten warped heads so that the cam bore alignment will not be a problem.
Even if it isn't warped end to end, there could be a good bit of distortion across the head at various places, such as between each combustion chamber or between bolts.
Most likely it is off to some degree, and simply replacing the head gasket without proper testing / checking, could mean going back into it in the near future.
BMJR