I can't figure what this noise is, I thought it was the generator, but with belt off still noise. Can a distributor make that noise? Listen! Thanks for any ideas. https://youtu.be/xT-iWu5VVcw
A worn vac brake piston/bore can make some pretty strange noises.You might disconnect and plug the vac line and start it again. If the noise goes away,that's the culprit.