I do one at a time here. With all the fancy camshafts and varying degrees at .050 .006 .004 etc etc... I don't feel comfortable adjusting lash unless I know each lobe is "exactly" on the base circle and not 20 or 30 or 50 degrees off the base circle. Trying to do 2 cylinders at a time, one of those isn't going to be exactly on the base circle, that's impossible.
The way I do that is rotate each valve until I see max lift, mark the balancer with a piece of tape and a reference point. Then rotate the engine one complete revolution. That will put that particular lobe exactly on it's base circle. Then I make my adjustment.
This method takes longer but it is much more accurate.
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