it shouldn't be machined at all [or at least, not with "traditional" gear] for the reasons stated. it just needs to be lapped on a properly flat rigid bed.
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17 years ago
91 civic - tough question about cooling
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17 years ago
Radiators are relatively soft. I once saw the neck of the radiator had become "out-of-round", causing several new radiator caps to blow air bubbles into the puke can because an effective seal was not formed. A new radiator fixed the problem. You might check for gunk build-up in the neck which could cause an incomplete seal.
Later, Ralph