PostModification Event.

src/main/java/mod/chiselsandbits/api/EventBlockBitPostModification.java

@@ -0,0 +1,32 @@
+package mod.chiselsandbits.api;
+
+import net.minecraft.util.math.BlockPos;
+import net.minecraft.world.World;
+import net.minecraftforge.fml.common.eventhandler.Event;
+
+public class EventBlockBitPostModification extends Event
+{
+
+	private final World w;
+	private final BlockPos pos;
+
+	public EventBlockBitPostModification(
+			final World w,
+			final BlockPos pos )
+	{
+
+		this.w = w;
+		this.pos = pos;
+	}
+
+	public World getWorld()
+	{
+		return w;
+	}
+
+	public BlockPos getPos()
+	{
+		return pos;
+	}
+
+}

src/main/java/mod/chiselsandbits/chiseledblock/TileEntityBlockChiseled.java

@@ -3,6 +3,7 @@
 import java.util.Collection;
 import java.util.Collections;
 
+import mod.chiselsandbits.api.EventBlockBitPostModification;
 import mod.chiselsandbits.api.EventFullBlockRestoration;
 import mod.chiselsandbits.api.ItemType;
 import mod.chiselsandbits.chiseledblock.data.VoxelBlob;
@@ -242,6 +243,15 @@ public IBlockState getBlockState(
 	public void setState(
 			final IExtendedBlockState state )
 	{
+		final VoxelBlobStateReference originalRef = getBasicState().getValue( BlockChiseled.UProperty_VoxelBlob );
+		final VoxelBlobStateReference newRef = state.getValue( BlockChiseled.UProperty_VoxelBlob );
+
+		if ( originalRef != null && newRef != null && !newRef.equals( originalRef ) )
+		{
+			final EventBlockBitPostModification bmm = new EventBlockBitPostModification( getWorld(), getPos() );
+			MinecraftForge.EVENT_BUS.post( bmm );
+		}
+
 		this.state = state;
 	}