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For the block, data values determine the block placement:

DV Description
0 (unused)
1 On the floor (rotation is stored in the tile entity)
2 On a wall, facing north
3 On a wall, facing south
4 On a wall, facing east
5 On a wall, facing west

For the item and for the tile entity, data values determine the skull type:

DV Description
0 Skeleton Skull
1 Wither Skeleton Skull
2 Zombie Head
3 Head
4 Creeper Head
5 Dragon Head