I placed a slimeblock in front of a piston and powered i but it doesn't seem to push it.
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The piston can't push more than 12 blocks, and the slime block in the picture is attached to the ground, which, to move, would require pushing more than 12 blocks. http://i.imgur.com/JdDe2ig.png
The slime block has to be in the air in order for it to work.