Help! Wiped cam lobes? - Video inside

with nonadjustable rockers, should be no slack in valve train. pushrods should spin as does the lifters. all rockers should move same amount , when running. need to run with covers off for few seconds and listen to rockers and observe movements. also, can run a cranking compression test. hook up a vacuum gauge , and see if vacuum holds steady. if cam is bad, it will move. just have to test.