diff --git a/system/updated/casync/common.py b/system/updated/casync/common.py
index b30494b2bb..db9b4b1e10 100644
--- a/system/updated/casync/common.py
+++ b/system/updated/casync/common.py
@@ -7,7 +7,7 @@ from openpilot.system.version import BUILD_METADATA_FILENAME, BuildMetadata
 from openpilot.system.updated.casync import tar
 
 
-CASYNC_ARGS = ["--with=symlinks", "--with=permissions", "--compression=xz"]
+CASYNC_ARGS = ["--with=symlinks", "--with=permissions", "--compression=xz", "--chunk-size=16M"]
 CASYNC_FILES = [BUILD_METADATA_FILENAME]
 
 
diff --git a/system/updated/casync/tar.py b/system/updated/casync/tar.py
index 725ab4251d..5c547e73a2 100644
--- a/system/updated/casync/tar.py
+++ b/system/updated/casync/tar.py
@@ -25,11 +25,11 @@ def create_tar_archive(filename: pathlib.Path, directory: pathlib.Path, include:
         info = tarfile.TarInfo(relative_path)
         info.size = file.stat().st_size
         info.type = tarfile.REGTYPE
+        info.mode = file.stat().st_mode
         with file.open('rb') as f:
           tar.addfile(info, f)
 
 
-
 def extract_tar_archive(fh: IO[bytes], directory: pathlib.Path):
   """Extracts a tar archive to a directory"""