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I want a head that still has the camshaft bearing journals aligned. I don't want warped or misaligned journals. If the journals are within 0.001in-0.002in alignment, that works for me.
Any misalignment of the journals can be approximately equivalent to any deck warpage lengthwise. So you have to check the cam journals.
The rule of thumb on aluminum head decks is:
...resurface if warpage, brinelling, or sinking is 0.002in or more.
Regarding camshaft journals: I have read sources that list allowable cam journal misalignment at 0.004in. And when the misalignment exceeds the 0.004in spec, then the journals should be align bored or align honed.
I can work with cam journal alignment variance of up to 0.002in; but if the misalignment is greater than 0.002in, align boring or align honing of the cam journals then gets added to the list.
I would rather start with a head that does not need that procedure.
copyright stealthfti
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