diff --git a/crates/starknet_state_sync/src/lib.rs b/crates/starknet_state_sync/src/lib.rs
index 1f86107806..8c371ca7ef 100644
--- a/crates/starknet_state_sync/src/lib.rs
+++ b/crates/starknet_state_sync/src/lib.rs
@@ -2,6 +2,8 @@ pub mod config;
 pub mod runner;
 
 use async_trait::async_trait;
+use futures::channel::mpsc::{channel, Sender};
+use futures::SinkExt;
 use papyrus_storage::body::BodyStorageReader;
 use papyrus_storage::state::StateStorageReader;
 use papyrus_storage::StorageReader;
@@ -12,18 +14,23 @@ use starknet_state_sync_types::communication::{
     StateSyncResponse,
     StateSyncResult,
 };
+use starknet_state_sync_types::errors::StateSyncError;
 use starknet_state_sync_types::state_sync_types::SyncBlock;
 
 use crate::config::StateSyncConfig;
 use crate::runner::StateSyncRunner;
 
+const BUFFER_SIZE: usize = 100000;
+
 pub fn create_state_sync_and_runner(config: StateSyncConfig) -> (StateSync, StateSyncRunner) {
-    let (state_sync_runner, storage_reader) = StateSyncRunner::new(config);
-    (StateSync { storage_reader }, state_sync_runner)
+    let (new_block_sender, new_block_receiver) = channel(BUFFER_SIZE);
+    let (state_sync_runner, storage_reader) = StateSyncRunner::new(config, new_block_receiver);
+    (StateSync { storage_reader, new_block_sender }, state_sync_runner)
 }
 
 pub struct StateSync {
     storage_reader: StorageReader,
+    new_block_sender: Sender<(BlockNumber, SyncBlock)>,
 }
 
 // TODO(shahak): Have StateSyncRunner call StateSync instead of the opposite once we stop supporting
@@ -35,8 +42,13 @@ impl ComponentRequestHandler<StateSyncRequest, StateSyncResponse> for StateSync
             StateSyncRequest::GetBlock(block_number) => {
                 StateSyncResponse::GetBlock(self.get_block(block_number))
             }
-            StateSyncRequest::AddNewBlock(_block_number, _sync_block) => {
-                todo!()
+            StateSyncRequest::AddNewBlock(block_number, sync_block) => {
+                StateSyncResponse::AddNewBlock(
+                    self.new_block_sender
+                        .send((block_number, sync_block))
+                        .await
+                        .map_err(|_| StateSyncError::P2PSyncClientError),
+                )
             }
         }
     }
diff --git a/crates/starknet_state_sync/src/runner/mod.rs b/crates/starknet_state_sync/src/runner/mod.rs
index 6e333adcff..7733d42b8a 100644
--- a/crates/starknet_state_sync/src/runner/mod.rs
+++ b/crates/starknet_state_sync/src/runner/mod.rs
@@ -2,15 +2,18 @@
 mod test;
 
 use async_trait::async_trait;
+use futures::channel::mpsc::Receiver;
 use futures::future::BoxFuture;
-use futures::{FutureExt, StreamExt};
+use futures::FutureExt;
 use papyrus_network::network_manager::{self, NetworkError};
 use papyrus_p2p_sync::client::{P2PSyncClient, P2PSyncClientChannels, P2PSyncClientError};
 use papyrus_p2p_sync::server::{P2PSyncServer, P2PSyncServerChannels};
 use papyrus_p2p_sync::{Protocol, BUFFER_SIZE};
 use papyrus_storage::{open_storage, StorageReader};
+use starknet_api::block::BlockNumber;
 use starknet_sequencer_infra::component_definitions::ComponentStarter;
 use starknet_sequencer_infra::errors::ComponentError;
+use starknet_state_sync_types::state_sync_types::SyncBlock;
 
 use crate::config::StateSyncConfig;
 
@@ -37,7 +40,10 @@ impl ComponentStarter for StateSyncRunner {
 }
 
 impl StateSyncRunner {
-    pub fn new(config: StateSyncConfig) -> (Self, StorageReader) {
+    pub fn new(
+        config: StateSyncConfig,
+        new_block_receiver: Receiver<(BlockNumber, SyncBlock)>,
+    ) -> (Self, StorageReader) {
         let (storage_reader, storage_writer) =
             open_storage(config.storage_config).expect("StateSyncRunner failed opening storage");
 
@@ -65,7 +71,7 @@ impl StateSyncRunner {
             storage_reader.clone(),
             storage_writer,
             p2p_sync_client_channels,
-            futures::stream::pending().boxed(),
+            Box::pin(new_block_receiver),
         );
 
         let header_server_receiver = network_manager
diff --git a/crates/starknet_state_sync_types/src/errors.rs b/crates/starknet_state_sync_types/src/errors.rs
index f5842256ac..f37d039aa9 100644
--- a/crates/starknet_state_sync_types/src/errors.rs
+++ b/crates/starknet_state_sync_types/src/errors.rs
@@ -10,6 +10,8 @@ pub enum StateSyncError {
     // We put the string of the error instead.
     #[error("Unexpected storage error: {0}")]
     StorageError(String),
+    #[error("Failed to send message to P2pSyncClient")]
+    P2PSyncClientError,
 }
 
 impl From<StorageError> for StateSyncError {