Got my first classic not too long ago, a '61 C10. Engine started making this noise recently and I don't have anybody to ask about it. I'm new to all things mechanical but I'm trying to learn. It's a 235 straight six.
Here's a quick video I made to capture the sound:
Kind of reminds me of bike spokes slapping against a playing card. Any ideas? I replaced the head gasket but the noise is still there. It is possible I did not do that correctly, but I believe I did. Any help is greatly appreciated.
