diff --git a/src/main/java/net/minecraft/server/PortalTravelAgent.java b/src/main/java/net/minecraft/server/PortalTravelAgent.java
index e75220af2c..be3c2b78e5 100644
--- a/src/main/java/net/minecraft/server/PortalTravelAgent.java
+++ b/src/main/java/net/minecraft/server/PortalTravelAgent.java
@@ -66,7 +66,7 @@ public class PortalTravelAgent {
             for (int k1 = i1 - short1; k1 <= i1 + short1; ++k1) {
                 double d3 = (double) k1 + 0.5D - entity.locZ;
 
-                for (int l1 = 127; l1 >= 0; --l1) {
+                for (int l1 = 255; l1 >= 0; --l1) { // CraftBukkit - 127 -> 255
                     if (world.getTypeId(j1, l1, k1) == Block.PORTAL.id) {
                         while (world.getTypeId(j1, l1 - 1, k1) == Block.PORTAL.id) {
                             --l1;
@@ -150,7 +150,7 @@ public class PortalTravelAgent {
                 d2 = (double) j2 + 0.5D - entity.locZ;
 
                 label274:
-                for (l2 = 127; l2 >= 0; --l2) {
+                for (l2 = 255; l2 >= 0; --l2) { // CraftBukkit - 127 -> 255
                     if (world.isEmpty(i2, l2, j2)) {
                         while (l2 > 0 && world.isEmpty(i2, l2 - 1, j2)) {
                             --l2;
@@ -201,7 +201,7 @@ public class PortalTravelAgent {
                     d2 = (double) j2 + 0.5D - entity.locZ;
 
                     label222:
-                    for (l2 = 127; l2 >= 0; --l2) {
+                    for (l2 = 255; l2 >= 0; --l2) { // CraftBukkit - 127 -> 255
                         if (world.isEmpty(i2, l2, j2)) {
                             while (l2 > 0 && world.isEmpty(i2, l2 - 1, j2)) {
                                 --l2;
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index 6cbadc1c6c..2202b0ed10 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1923,7 +1923,7 @@ public class World implements IBlockAccess {
             int k = this.g >> 2;
             int l = k & 15;
             int i1 = k >> 8 & 15;
-            int j1 = k >> 16 & 127;
+            int j1 = k >> 16 & 255; // CraftBukkit - 127 -> 255
             int k1 = chunk.getTypeId(l, j1, i1);
 
             l += i;
diff --git a/src/main/java/org/bukkit/craftbukkit/ChunkCompressionThread.java b/src/main/java/org/bukkit/craftbukkit/ChunkCompressionThread.java
index dcab889bcf..4303c60b38 100644
--- a/src/main/java/org/bukkit/craftbukkit/ChunkCompressionThread.java
+++ b/src/main/java/org/bukkit/craftbukkit/ChunkCompressionThread.java
@@ -18,7 +18,7 @@ public final class ChunkCompressionThread implements Runnable {
     private final HashMap<EntityPlayer, Integer> queueSizePerPlayer = new HashMap<EntityPlayer, Integer>();
     private final BlockingQueue<QueuedPacket> packetQueue = new LinkedBlockingQueue<QueuedPacket>(QUEUE_CAPACITY);
 
-    private final int CHUNK_SIZE = 16 * 128 * 16 * 5 / 2;
+    private final int CHUNK_SIZE = 16 * 256 * 16 * 5 / 2;
     private final int REDUCED_DEFLATE_THRESHOLD = CHUNK_SIZE / 4;
     private final int DEFLATE_LEVEL_CHUNKS = 6;
     private final int DEFLATE_LEVEL_PARTS = 1;
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
index 0cfd5fe002..f4d2d0bde0 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftChunk.java
@@ -69,7 +69,7 @@ public class CraftChunk implements Chunk {
     }
 
     public Block getBlock(int x, int y, int z) {
-        return new CraftBlock(this, (getX() << 4) | (x & 0xF), y & 0x7F, (getZ() << 4) | (z & 0xF));
+        return new CraftBlock(this, (getX() << 4) | (x & 0xF), y & 0xFF, (getZ() << 4) | (z & 0xF));
     }
 
     public Entity[] getEntities() {
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 1d53bd539e..6b9553ebd6 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -78,7 +78,7 @@ public class CraftWorld implements World {
     }
 
     public Block getBlockAt(int x, int y, int z) {
-        return getChunkAt(x >> 4, z >> 4).getBlock(x & 0xF, y & 0x7F, z & 0xF);
+        return getChunkAt(x >> 4, z >> 4).getBlock(x & 0xF, y & 0xFF, z & 0xF);
     }
 
     public int getBlockTypeIdAt(int x, int y, int z) {
@@ -224,7 +224,7 @@ public class CraftWorld implements World {
         for (int xx = px; xx < (px + 16); xx++) {
             world.notify(xx, 0, pz);
         }
-        world.notify(px, 127, pz + 15);
+        world.notify(px, 255, pz + 15);
 
         return true;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/PortalTravelAgent.java b/src/main/java/org/bukkit/craftbukkit/PortalTravelAgent.java
index 495c586a08..72cc84e1c2 100644
--- a/src/main/java/org/bukkit/craftbukkit/PortalTravelAgent.java
+++ b/src/main/java/org/bukkit/craftbukkit/PortalTravelAgent.java
@@ -87,7 +87,7 @@ public class PortalTravelAgent implements TravelAgent {
             for (int k1 = i1 - this.searchRadius; k1 <= i1 + this.searchRadius; ++k1) {
                 double d3 = (double) k1 + 0.5D - location.getZ();
 
-                for (int l1 = 127; l1 >= 0; --l1) {
+                for (int l1 = 255; l1 >= 0; --l1) {
                     if (world.getTypeId(j1, l1, k1) == Block.PORTAL.id) {
                         while (world.getTypeId(j1, l1 - 1, k1) == Block.PORTAL.id) {
                             --l1;
@@ -194,7 +194,7 @@ public class PortalTravelAgent implements TravelAgent {
                 d2 = (double) j2 + 0.5D - location.getZ();
 
                 label271:
-                for (l2 = 127; l2 >= 0; --l2) {
+                for (l2 = 255; l2 >= 0; --l2) {
                     if (world.isEmpty(i2, l2, j2)) {
                         while (l2 > 0 && world.isEmpty(i2, l2 - 1, j2)) {
                             --l2;
@@ -245,7 +245,7 @@ public class PortalTravelAgent implements TravelAgent {
                     d2 = (double) j2 + 0.5D - location.getZ();
 
                     label219:
-                    for (l2 = 127; l2 >= 0; --l2) {
+                    for (l2 = 255; l2 >= 0; --l2) {
                         if (world.isEmpty(i2, l2, j2)) {
                             while (l2 > 0 && world.isEmpty(i2, l2 - 1, j2)) {
                                 --l2;
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
index 89ffd25ff8..ec8d156a87 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
@@ -80,7 +80,7 @@ public class CraftBlock implements Block {
     }
 
     public byte getData() {
-        return (byte) chunk.getHandle().getData(this.x & 0xF, this.y & 0x7F, this.z & 0xF);
+        return (byte) chunk.getHandle().getData(this.x & 0xF, this.y & 0xFF, this.z & 0xF);
     }
 
     public void setType(final Material type) {
@@ -116,7 +116,7 @@ public class CraftBlock implements Block {
     }
 
     public int getTypeId() {
-        return chunk.getHandle().getTypeId(this.x & 0xF, this.y & 0x7F, this.z & 0xF);
+        return chunk.getHandle().getTypeId(this.x & 0xF, this.y & 0xFF, this.z & 0xF);
     }
 
     public byte getLightLevel() {
@@ -124,11 +124,11 @@ public class CraftBlock implements Block {
     }
 
     public byte getLightFromSky() {
-        return (byte) chunk.getHandle().getBrightness(EnumSkyBlock.SKY, this.x & 0xF, this.y & 0x7F, this.z & 0xF);
+        return (byte) chunk.getHandle().getBrightness(EnumSkyBlock.SKY, this.x & 0xF, this.y & 0xFF, this.z & 0xF);
     }
 
     public byte getLightFromBlocks() {
-        return (byte) chunk.getHandle().getBrightness(EnumSkyBlock.BLOCK, this.x & 0xF, this.y & 0x7F, this.z & 0xF);
+        return (byte) chunk.getHandle().getBrightness(EnumSkyBlock.BLOCK, this.x & 0xF, this.y & 0xFF, this.z & 0xF);
     }