RE: removing cylinderheads
I would recommend loosening the rocker arms (but leave them on) and slip the push rod out of the seat in the rocker arms and then remove them before taking the head off because if you don't remove them first then you will have to be very careful while you remove the head so that it doesn't slip back down and dmg one of the push rods while your taking it off... but to give you a simple answer to your questions yes it is possible to take the heads off without removing the rocker arms.
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There is no replacement for displacement
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