Make blocks face opposite directions?

Im having a difficult time trying to figure out how to make the chests face opposite directions. Currently the chests are doing the same way. What is needed to correct the facing direction?

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PHP:

    @EventHandler
    public void onSignChange(SignChangeEvent event){
        Block block = event.getBlock();
        Player player = event.getPlayer();
        BlockState signState = block.getState();
        Sign sign = (Sign)signState;
        if(event.getLine(0).equals("[bacon]")){
            sign.setLine(2, "Linked");
            block.getRelative(BlockFace.EAST).setType(Material.CHEST);
            block.getRelative(BlockFace.WEST).setType(Material.CHEST);
            sign.update();
        }