diff --git a/src/block.rs b/src/block.rs
index 35e56f19c..beb35fc41 100644
--- a/src/block.rs
+++ b/src/block.rs
@@ -126,6 +126,15 @@ impl<'x, 'y> OpenBlock<'x, 'y> {
 	/// Alter the timestamp of the block.
 	pub fn set_timestamp(&mut self, timestamp: u64) { self.block.header.set_timestamp(timestamp); }
 
+	/// Alter the difficulty for the block.
+	pub fn set_difficulty(&mut self, a: U256) { self.block.header.set_difficulty(a); }
+
+	/// Alter the gas limit for the block.
+	pub fn set_gas_limit(&mut self, a: U256) { self.block.header.set_gas_limit(a); }
+
+	/// Alter the gas limit for the block.
+	pub fn set_gas_used(&mut self, a: U256) { self.block.header.set_gas_used(a); }
+
 	/// Alter the extra_data for the block.
 	pub fn set_extra_data(&mut self, extra_data: Bytes) -> Result<(), BlockError> {
 		if extra_data.len() > self.engine.maximum_extra_data_size() {
@@ -158,7 +167,7 @@ impl<'x, 'y> OpenBlock<'x, 'y> {
 			author: self.block.header.author.clone(),
 			timestamp: self.block.header.timestamp,
 			difficulty: self.block.header.difficulty.clone(),
-			last_hashes: self.last_hashes.clone(),
+			last_hashes: self.last_hashes.clone(),		// TODO: should be a reference.
 			gas_used: self.block.archive.last().map(|t| t.receipt.gas_used).unwrap_or(U256::from(0)),
 			gas_limit: self.block.header.gas_limit.clone(),
 		}
@@ -169,6 +178,7 @@ impl<'x, 'y> OpenBlock<'x, 'y> {
 	/// If valid, it will be executed, and archived together with the receipt.
 	pub fn push_transaction(&mut self, t: Transaction, h: Option<H256>) -> Result<&Receipt, Error> {
 		let env_info = self.env_info();
+//		info!("env_info says gas_used={}", env_info.gas_used);
 		match self.block.state.apply(&env_info, self.engine, &t) {
 			Ok(receipt) => {
 				self.block.archive_set.insert(h.unwrap_or_else(||t.hash()));
@@ -260,10 +270,14 @@ pub fn enact<'x, 'y>(block_bytes: &[u8], engine: &'x Engine, db: OverlayDB, pare
 		let s = State::from_existing(db.clone(), parent.state_root().clone(), engine.account_start_nonce());
 //		flush(format!("enact(): root={}, author={}, author_balance={}\n", s.root(), header.author(), s.balance(&header.author())));
 	}
+
 	let block = BlockView::new(block_bytes);
 	let header = block.header_view();
 	let mut b = OpenBlock::new(engine, db, parent, last_hashes, header.author(), header.extra_data());
+	b.set_difficulty(header.difficulty());
+	b.set_gas_limit(header.gas_limit());
 	b.set_timestamp(header.timestamp());
+//	info!("enact: Enacting #{}. env_info={:?}", header.number(), b.env_info());
 	for t in block.transactions().into_iter() { try!(b.push_transaction(t, None)); }
 	for u in block.uncles().into_iter() { try!(b.push_uncle(u)); }
 	Ok(b.close())
diff --git a/src/ethereum/ethash.rs b/src/ethereum/ethash.rs
index 69fb2691f..989ab8cd9 100644
--- a/src/ethereum/ethash.rs
+++ b/src/ethereum/ethash.rs
@@ -43,6 +43,8 @@ impl Engine for Ethash {
 				max(gas_floor_target, gas_limit - gas_limit / bound_divisor + x!(1) + (header.gas_used * x!(6) / x!(5)) / bound_divisor)
 			}
 		};
+
+//		info!("ethash: populate_from_parent #{}: difficulty={} and gas_limit={}", header.number, header.difficulty, header.gas_limit);
 	}
 
 	/// Apply the block reward on finalisation of the block.
diff --git a/src/executive.rs b/src/executive.rs
index 867023528..9d2562029 100644
--- a/src/executive.rs
+++ b/src/executive.rs
@@ -196,8 +196,6 @@ impl<'a> Executive<'a> {
 			// part of substate that may be reverted
 			let mut unconfirmed_substate = Substate::new();
 
-			info!("exec: call; env_info={:?}", self.info);
-
 			let res = {
 				let mut ext = self.to_externalities(params, &mut unconfirmed_substate, OutputPolicy::Return(output));
 				let evm = Factory::create();
diff --git a/src/header.rs b/src/header.rs
index 45190332d..9226137b3 100644
--- a/src/header.rs
+++ b/src/header.rs
@@ -67,7 +67,9 @@ impl Header {
 
 	pub fn state_root(&self) -> &H256 { &self.state_root }
 	pub fn receipts_root(&self) -> &H256 { &self.receipts_root }
+	pub fn gas_limit(&self) -> &U256 { &self.gas_limit }
 
+	pub fn difficulty(&self) -> &U256 { &self.difficulty }
 	pub fn seal(&self) -> &Vec<Bytes> { &self.seal }
 
 	// TODO: seal_at, set_seal_at &c.
@@ -79,6 +81,10 @@ impl Header {
 
 	pub fn set_extra_data(&mut self, a: Bytes) { if a != self.extra_data { self.extra_data = a; self.note_dirty(); } }
 
+	pub fn set_gas_used(&mut self, a: U256) { self.gas_used = a; self.note_dirty(); }
+	pub fn set_gas_limit(&mut self, a: U256) { self.gas_limit = a; self.note_dirty(); }
+
+	pub fn set_difficulty(&mut self, a: U256) { self.difficulty = a; self.note_dirty(); }
 	pub fn set_seal(&mut self, a: Vec<Bytes>) { self.seal = a; self.note_dirty(); }
 
 	/// Get the hash of this header (sha3 of the RLP).