If you can position it such that the whole surface of is illuminated with no parts in shadow, then wouldn't that mean you have a reasonably flat surface?
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Hi OSS,If the cylinder head is off the engine, there’s no good reason to not take it to a qualified machine shop for them to refurbish it.
They’ll check flatness of the deck and machine it if necessary
Don’t use sandpaper and glass. I tried that and had to stop because the glass was warping just enough to follow the warpage of the cast iron. I used 5/8” tempered shower glass and it still had too much movement. Just go to a machine shop. It’s nice to know how much material was removed and you can’t know that using sandpaper.seems somewhat reasonable but can you guarantee you aren't at a slight angle pointing in toward the far end of the cylinder?
I'd like to see the same laser on a freshly machined head.
ALSO, if you're going table top laser level/flat gauge, maybe just give it one of those glass table top/sand paper flatting jobs to be safe