diff --git a/infra/build/functions/build_lib.py b/infra/build/functions/build_lib.py
index 0e5b90939..581b6b7ce 100644
--- a/infra/build/functions/build_lib.py
+++ b/infra/build/functions/build_lib.py
@@ -23,16 +23,13 @@ import six.moves.urllib.parse as urlparse
 import sys
 import time
 import subprocess
-import tarfile
 import tempfile
 import json
-import uuid
 
 from googleapiclient.discovery import build as cloud_build
 import googleapiclient.discovery
 import google.api_core.client_options
 import google.auth
-from google.cloud import storage
 from oauth2client import service_account as service_account_lib
 import requests
 import yaml
@@ -550,15 +547,6 @@ def get_build_body(steps,
   return build_body
 
 
-def _tgz_local_build(oss_fuzz_project, temp_tgz_path):
-  """Prepare a .tgz containing the files required to build `oss_fuzz_project`."""
-  # Just the projects/<project> dir should be sufficient.
-  project_rel_path = os.path.join('projects', oss_fuzz_project)
-  with tarfile.open(temp_tgz_path, 'w:gz') as tar:
-    tar.add(os.path.join(OSS_FUZZ_ROOT, project_rel_path),
-            arcname=project_rel_path)
-
-
 def run_build(  # pylint: disable=too-many-arguments
     oss_fuzz_project,
     steps,
@@ -578,24 +566,23 @@ def run_build(  # pylint: disable=too-many-arguments
                               use_build_pool=use_build_pool,
                               experiment=experiment)
   if experiment:
-    with tempfile.NamedTemporaryFile(suffix='source.tgz') as tgz_file:
-      # Archive the necessary files for the build.
-      _tgz_local_build(oss_fuzz_project, tgz_file.name)
-      gcs_client = storage.Client()
-      # This is the automatically created Cloud Build bucket for Cloud Build.
-      bucket_name = gcs_client.project + '_cloudbuild'
-      bucket = gcs_client.bucket(bucket_name)
-      blob_name = f'source/{str(uuid.uuid4())}.tgz'
-      blob = bucket.blob(blob_name)
-      logging.info(f'Uploading project to {bucket_name}/{blob_name}')
-      blob.upload_from_filename(tgz_file.name)
-
-      build_body['source'] = {
-          'storageSource': {
-              'bucket': bucket_name,
-              'object': blob_name,
-          }
-      }
+    with tempfile.NamedTemporaryFile(suffix='build.json') as config_file:
+      config_file.write(bytes(json.dumps(build_body), 'utf-8'))
+      config_file.seek(0)
+      result = subprocess.run([
+          'gcloud',
+          'builds',
+          'submit',
+          '--project=oss-fuzz',
+          f'--config={config_file.name}',
+          '--async',
+          '--format=get(id)',
+      ],
+                              stdout=subprocess.PIPE,
+                              cwd=OSS_FUZZ_ROOT,
+                              encoding='utf-8',
+                              check=True)
+      return result.stdout.strip()
 
   cloudbuild = cloud_build('cloudbuild',
                            'v1',
@@ -643,4 +630,4 @@ def cancel_build(build_id, credentials, cloud_project):
                            cache_discovery=False,
                            client_options=US_CENTRAL_CLIENT_OPTIONS)
   cloudbuild.projects().builds().cancel(projectId=cloud_project,
-                                        id=build_id).execute()
+                                        id=build_id).execute()
\ No newline at end of file