I had that happen once and it was a broken valve spring. I would take the valve covers off and look with the motor not running. If it is a spring, stud or rocker you should be able to see it.
If you need to do it with the car running, buy yoga mats (yes I said that). You can get them at Tuesday morning and similar places for like $9. They are like giant fender covers that will wrap around whatever you need.
My guess is you will see it as soon as you take the valve cover off
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