diff --git a/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/backward/BWBlock.java b/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/backward/BWBlock.java
index 04b346843..284017c89 100644
--- a/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/backward/BWBlock.java
+++ b/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/backward/BWBlock.java
@@ -70,9 +70,10 @@ public BWBlock(net.minecraft.block.Block block, World world, Vector3D pos) {
 		this.mcBlock = block;
 		components.add(new BWBlockTransform(this, world, pos));
 		components.add(new BlockProperty.Opacity()).setOpacity(() -> mcBlock.getMaterial().isOpaque() ? 1 : 0);
-		Optional.of(components.add(new BlockProperty.Replaceable()))
-			.filter(r -> block != Blocks.air)
-			.ifPresent(r -> r.setReplaceable(() -> mcBlock.isReplaceable(blockAccess(), xi(), yi(), zi())));
+		BlockProperty.Replaceable replaceable = components.add(new BlockProperty.Replaceable());
+		if (block != Blocks.air) {
+			replaceable.setReplaceable(() -> mcBlock.canPlaceBlockAt((net.minecraft.world.World) blockAccess(), xi(), yi(), zi()));
+		}
 
 		BlockProperty.BlockSound blockSound = components.add(new BlockProperty.BlockSound());
 		blockSound.setBlockSound(BlockProperty.BlockSound.BlockSoundTrigger.PLACE, new Sound("", mcBlock.stepSound.func_150496_b()));
diff --git a/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/forward/FWBlock.java b/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/forward/FWBlock.java
index aac40a30a..3b4e8bf29 100644
--- a/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/forward/FWBlock.java
+++ b/minecraft/1.7/src/main/java/nova/core/wrapper/mc/forge/v17/wrapper/block/forward/FWBlock.java
@@ -494,6 +494,21 @@ public void renderItem(ItemRenderType type, ItemStack item, Object... data) {
 	@Override
 	public float getExplosionResistance(Entity expEntity, World world, int x, int y, int z, double explosionX, double p_explosionresistance, double explosionY) {
 		// TODO: Maybe do something withPriority these parameters.
+
+		// This number was calculated from the blast resistance of Stone,
+		// which requires exactly one cubic meter of TNT to get blown up.
+		//
+		//   1. During construction, the setResistance method is called
+		//     on minecraft:stone with a value of 10.
+		//
+		//   2. The setResistance method multiplies that by 3 and assigns
+		//      the result to the blockResistance instance variable.
+		//
+		//   3. Finally, the getExplosionResistance method divides the
+		//      blockResistance instance variable by 5 and returns the result.
+		//
+		// From this we see that minecraft:stone’s final blast resistance is 6.
+
 		return (float) getBlockInstance(world, new Vector3D(x, y, z)).getResistance() * 6;
 	}
 
diff --git a/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/backward/BWBlock.java b/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/backward/BWBlock.java
index 839543baa..a8c34fc54 100644
--- a/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/backward/BWBlock.java
+++ b/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/backward/BWBlock.java
@@ -75,9 +75,10 @@ public BWBlock(net.minecraft.block.Block block, World world, Vector3D pos) {
 		this.mcBlock = block;
 		components.add(new BWBlockTransform(this, world, pos));
 		components.add(new BlockProperty.Opacity()).setOpacity(() -> mcBlock.getMaterial().isOpaque() ? 1 : 0);
-		Optional.of(components.add(new BlockProperty.Replaceable()))
-			.filter(r -> block != Blocks.air)
-			.ifPresent(r -> r.setReplaceable(() -> mcBlock.isReplaceable((net.minecraft.world.World) blockAccess(), blockPos())));
+		BlockProperty.Replaceable replaceable = components.add(new BlockProperty.Replaceable());
+		if (block != Blocks.air) {
+			replaceable.setReplaceable(() -> mcBlock.canPlaceBlockAt((net.minecraft.world.World) blockAccess(), blockPos()));
+		}
 
 		BlockProperty.BlockSound blockSound = components.add(new BlockProperty.BlockSound());
 		blockSound.setBlockSound(BlockProperty.BlockSound.BlockSoundTrigger.PLACE, new Sound("", mcBlock.stepSound.getPlaceSound()));
@@ -171,7 +172,7 @@ public boolean shouldDisplacePlacement() {
 			return false;
 		}
 
-		if (mcBlock == Blocks.vine || mcBlock == Blocks.tallgrass || mcBlock == Blocks.deadbush || mcBlock.isReplaceable((net.minecraft.world.World) WorldConverter.instance().toNative(world()), new BlockPos(x(), y(), z()))) {
+		if (mcBlock == Blocks.vine || mcBlock == Blocks.tallgrass || mcBlock == Blocks.deadbush || mcBlock.isReplaceable((net.minecraft.world.World) blockAccess(), blockPos())) {
 			return false;
 		}
 		return super.shouldDisplacePlacement();
diff --git a/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/forward/FWBlock.java b/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/forward/FWBlock.java
index a737fa190..1417d0e38 100644
--- a/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/forward/FWBlock.java
+++ b/minecraft/1.8/src/main/java/nova/core/wrapper/mc/forge/v18/wrapper/block/forward/FWBlock.java
@@ -384,6 +384,21 @@ public String getLocalizedName() {
 	@Override
 	public float getExplosionResistance(World world, BlockPos pos, Entity exploder, Explosion explosion) {
 		// TODO: Maybe do something withPriority these parameters.
+
+		// This number was calculated from the blast resistance of Stone,
+		// which requires exactly one cubic meter of TNT to get blown up.
+		//
+		//   1. During construction, the setResistance method is called
+		//     on minecraft:stone with a value of 10.
+		//
+		//   2. The setResistance method multiplies that by 3 and assigns
+		//      the result to the blockResistance instance variable.
+		//
+		//   3. Finally, the getExplosionResistance method divides the
+		//      blockResistance instance variable by 5 and returns the result.
+		//
+		// From this we see that minecraft:stone’s final blast resistance is 6.
+
 		return (float) getBlockInstance(world, VectorConverter.instance().toNova(pos)).getResistance() * 6;
 	}