The weight of that head isn't much compared to the rest of the engine, but when one person (Stooge #1) has to lift it off the cylinder, AND carry it down from the engine alone.  We had to so that the pistons could come out.  That was a real chore.  To top things off there was a dead bird lodged in one of the sparkplug holes.  Boy did that thing stink!!  The head was sandblasted and  replaced after the pistons had been put back.