diff --git a/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitChunk_1_7.java b/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitChunk_1_7.java
index 161edf18..424d9151 100644
--- a/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitChunk_1_7.java
+++ b/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitChunk_1_7.java
@@ -32,6 +32,11 @@ public class BukkitChunk_1_7 extends CharFaweChunk<Chunk> {
         return datas[i];
     }
 
+    @Override
+    public void setBlock(int x, int y, int z, int id) {
+        this.setBlock(x, y, z, id, 0);
+    }
+
     @Override
     public void setBlock(int x, int y, int z, int id, int data) {
         int i = FaweCache.CACHE_I[y][z][x];
@@ -47,8 +52,7 @@ public class BukkitChunk_1_7 extends CharFaweChunk<Chunk> {
         this.count[i]++;
         switch (id) {
             case 0:
-                this.air[i]++;
-                vs[j] = -1;
+                vs[j] = 0;
                 vs2[j] = (char) 1;
                 return;
             case 11:
@@ -62,81 +66,19 @@ public class BukkitChunk_1_7 extends CharFaweChunk<Chunk> {
             case 138:
             case 169:
             case 213:
-                this.relight[i]++;
-            case 2:
-            case 4:
-            case 13:
-            case 14:
-            case 15:
-            case 20:
-            case 21:
-            case 22:
-            case 30:
-            case 32:
-            case 37:
-            case 41:
-            case 42:
-            case 45:
-            case 46:
-            case 47:
-            case 48:
-            case 49:
-            case 55:
-            case 56:
-            case 57:
-            case 58:
-            case 60:
-            case 7:
-            case 73:
-            case 79:
-            case 80:
-            case 81:
-            case 82:
-            case 83:
-            case 85:
-            case 87:
-            case 88:
-            case 101:
-            case 102:
-            case 103:
-            case 110:
-            case 112:
-            case 113:
-            case 121:
-            case 129:
-            case 133:
-            case 165:
-            case 166:
-            case 170:
-            case 172:
-            case 173:
-            case 174:
-            case 188:
-            case 189:
-            case 190:
-            case 191:
-            case 192:
-                vs[j] = (byte) (id);
-                vs2[j] = (char) (id << 4);
-                return;
             case 130:
             case 76:
             case 62:
             case 50:
             case 10:
                 this.relight[i]++;
-            case 54:
-            case 146:
-            case 61:
-            case 65:
-            case 68: // removed
             default:
                 vs2[j] = (char) ((id << 4) + data);
                 vs[j] = (byte) id;
                 if (data != 0) {
                     NibbleArray dataArray = datas[i];
                     if (dataArray == null) {
-                        datas[i] = dataArray = new NibbleArray(4096, 4);
+                        datas[i] = dataArray = new NibbleArray(new byte[2048], 4);
                     }
                     dataArray.a(x, y & 15, z, data);
                 }
diff --git a/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java b/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java
index ff16f4c6..a7a53a41 100644
--- a/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java
+++ b/bukkit1710/src/main/java/com/boydti/fawe/bukkit/v1_7/BukkitQueue17.java
@@ -65,9 +65,22 @@ import org.bukkit.generator.ChunkGenerator;
 
 public class BukkitQueue17 extends BukkitQueue_0<Chunk, ChunkSection[], ChunkSection> {
 
+    private static Field fieldData;
+    private static Field fieldIds;
+
     public BukkitQueue17(final String world) {
         super(world);
         checkVersion("v1_7_R4");
+        if (fieldData == null) {
+            try {
+                fieldData = ChunkSection.class.getDeclaredField("blockData");
+                fieldData.setAccessible(true);
+                fieldIds = ChunkSection.class.getDeclaredField("blockIds");
+                fieldIds.setAccessible(true);
+            } catch (NoSuchFieldException e) {
+                e.printStackTrace();
+            }
+        }
     }
 
     @Override
@@ -358,24 +371,31 @@ public class BukkitQueue17 extends BukkitQueue_0<Chunk, ChunkSection[], ChunkSec
                 if ((section == null) || (fs.getCount(j) >= 4096)) {
                     sections[j] = section = new ChunkSection(j << 4, flag);
                     section.setIdArray(newIdArray);
-                    section.setDataArray(newDataArray);
+                    if (newDataArray != null) {
+                        section.setDataArray(newDataArray);
+                    }
                     continue;
                 }
-                byte[] currentIdArray = section.getIdArray();
-                NibbleArray currentDataArray = section.getDataArray();
+                byte[] currentIdArray = (byte[]) fieldIds.get(section);
+                NibbleArray currentDataArray = (NibbleArray) fieldData.get(section);
                 boolean data = currentDataArray != null;
-                if (!data) {
+                if (!data && newDataArray != null) {
                     section.setDataArray(newDataArray);
                 }
+                if (currentIdArray == null) {
+                    section.setIdArray(newIdArray);
+                    continue;
+                }
                 boolean fill = true;
                 int solid = 0;
+                char[] charArray = fs.getIdArray(j);
                 for (int k = 0; k < newIdArray.length; k++) {
-                    byte n = newIdArray[k];
-                    switch (n) {
+                    char combined = charArray[k];
+                    switch (combined) {
                         case 0:
                             fill = false;
                             continue;
-                        case -1:
+                        case 1:
                             fill = false;
                             if (currentIdArray[k] != 0) {
                                 solid++;
@@ -384,16 +404,14 @@ public class BukkitQueue17 extends BukkitQueue_0<Chunk, ChunkSection[], ChunkSec
                             continue;
                         default:
                             solid++;
-                            currentIdArray[k] = n;
+                            currentIdArray[k] = newIdArray[k];
                             if (data) {
+                                int dataByte = FaweCache.getData(combined);
                                 int x = FaweCache.CACHE_X[0][k];
                                 int y = FaweCache.CACHE_Y[0][k];
                                 int z = FaweCache.CACHE_Z[0][k];
-                                int newData = newDataArray == null ? 0 : newDataArray.a(x, y, z);
-                                int currentData = currentDataArray == null ? 0 : currentDataArray.a(x, y, z);
-                                if (newData != currentData) {
-                                    currentDataArray.a(x, y, z, newData);
-                                }
+                                int newData = newDataArray.a(x, y, z);
+                                currentDataArray.a(x, y, z, newData);
                             }
                             continue;
                     }
@@ -489,13 +507,13 @@ public class BukkitQueue17 extends BukkitQueue_0<Chunk, ChunkSection[], ChunkSec
             // Send chunks
             int mask = fc.getBitMask();
             if (mask == 65535 && hasEntities(nmsChunk)) {
-                PacketPlayOutMapChunk packet = new PacketPlayOutMapChunk(nmsChunk, false, 65280, 25);
+                PacketPlayOutMapChunk packet = new PacketPlayOutMapChunk(nmsChunk, false, 65280, 5);
                 for (EntityPlayer player : players) {
                     player.playerConnection.sendPacket(packet);
                 }
                 mask = 255;
             }
-            PacketPlayOutMapChunk packet = new PacketPlayOutMapChunk(nmsChunk, false, mask, 25);
+            PacketPlayOutMapChunk packet = new PacketPlayOutMapChunk(nmsChunk, false, mask, 5);
             for (EntityPlayer player : players) {
                 player.playerConnection.sendPacket(packet);
             }