diff --git a/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/grpc.py.j2 b/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/grpc.py.j2
index 6438991b57..c8e721b9cc 100644
--- a/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/grpc.py.j2
+++ b/gapic/ads-templates/%namespace/%name/%version/%sub/services/%service/transports/grpc.py.j2
@@ -124,6 +124,10 @@ class {{ service.name }}GrpcTransport({{ service.name }}Transport):
                 ssl_credentials=ssl_credentials,
                 scopes=scopes or self.AUTH_SCOPES,
                 quota_project_id=quota_project_id,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
             self._ssl_channel_credentials = ssl_credentials
         else:
@@ -138,6 +142,10 @@ class {{ service.name }}GrpcTransport({{ service.name }}Transport):
                 credentials=credentials,
                 ssl_credentials=ssl_channel_credentials,
                 scopes=self.AUTH_SCOPES,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
 
         self._stubs = {}  # type: Dict[str, Callable]
diff --git a/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2 b/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
index 5dc0f26bab..b1b9ec2679 100644
--- a/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
+++ b/gapic/ads-templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
@@ -748,6 +748,10 @@ def test_{{ service.name|snake_case }}_transport_channel_mtls_with_client_cert_s
                 ),
                 ssl_credentials=mock_ssl_cred,
                 quota_project_id=None,
+                options=[
+                        ("grpc.max_send_message_length", -1),
+                        ("grpc.max_receive_message_length", -1),
+                ],
             )
             assert transport.grpc_channel == mock_grpc_channel
             assert transport._ssl_channel_credentials == mock_ssl_cred
@@ -787,6 +791,10 @@ def test_{{ service.name|snake_case }}_transport_channel_mtls_with_adc(
                 ),
                 ssl_credentials=mock_ssl_cred,
                 quota_project_id=None,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
             assert transport.grpc_channel == mock_grpc_channel
 
diff --git a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2 b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2
index 3d1f5ca9b2..0bcd1fa64f 100644
--- a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2
+++ b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc.py.j2
@@ -132,6 +132,10 @@ class {{ service.name }}GrpcTransport({{ service.name }}Transport):
                 ssl_credentials=ssl_credentials,
                 scopes=scopes or self.AUTH_SCOPES,
                 quota_project_id=quota_project_id,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
             self._ssl_channel_credentials = ssl_credentials
         else:
@@ -148,6 +152,10 @@ class {{ service.name }}GrpcTransport({{ service.name }}Transport):
                 ssl_credentials=ssl_channel_credentials,
                 scopes=scopes or self.AUTH_SCOPES,
                 quota_project_id=quota_project_id,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
 
         self._stubs = {}  # type: Dict[str, Callable]
diff --git a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2 b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2
index 5ea7031162..83013d83ee 100644
--- a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2
+++ b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/grpc_asyncio.py.j2
@@ -176,6 +176,10 @@ class {{ service.grpc_asyncio_transport_name }}({{ service.name }}Transport):
                 ssl_credentials=ssl_credentials,
                 scopes=scopes or self.AUTH_SCOPES,
                 quota_project_id=quota_project_id,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
             self._ssl_channel_credentials = ssl_credentials
         else:
@@ -192,6 +196,10 @@ class {{ service.grpc_asyncio_transport_name }}({{ service.name }}Transport):
                 ssl_credentials=ssl_channel_credentials,
                 scopes=scopes or self.AUTH_SCOPES,
                 quota_project_id=quota_project_id,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
 
         # Run the base constructor.
diff --git a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2 b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
index a25f66e2a7..ad7e4051b9 100644
--- a/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
+++ b/gapic/templates/%namespace/%name_%version/%sub/services/%service/transports/rest.py.j2
@@ -101,6 +101,10 @@ class {{ service.name }}RestTransport({{ service.name }}Transport):
                     self._host,
                     credentials=self._credentials,
                     scopes=self.AUTH_SCOPES,
+                    options=[
+                        ("grpc.max_send_message_length", -1),
+                        ("grpc.max_receive_message_length", -1),
+                    ],
                 )
             )
 
diff --git a/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2 b/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
index 5882e95f78..18108233b8 100644
--- a/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
+++ b/gapic/templates/tests/unit/gapic/%name_%version/%sub/test_%service.py.j2
@@ -1237,6 +1237,10 @@ def test_{{ service.name|snake_case }}_transport_channel_mtls_with_client_cert_s
                 ),
                 ssl_credentials=mock_ssl_cred,
                 quota_project_id=None,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
             assert transport.grpc_channel == mock_grpc_channel
             assert transport._ssl_channel_credentials == mock_ssl_cred
@@ -1276,6 +1280,10 @@ def test_{{ service.name|snake_case }}_transport_channel_mtls_with_adc(
                 ),
                 ssl_credentials=mock_ssl_cred,
                 quota_project_id=None,
+                options=[
+                    ("grpc.max_send_message_length", -1),
+                    ("grpc.max_receive_message_length", -1),
+                ],
             )
             assert transport.grpc_channel == mock_grpc_channel