Hey guys ok i got a knock when any load is put on car coming from the the top sounds like hitting the passenger valve cover, Pulled plugs were fine, doing a compression test in the morning. Took SC belt off still occur. It might be a PS pump or AC pump knocking not how common it is? But if i rev it and hold it sound goes away. I am leaning towards rockers or some part of valve train gone. Just hope its something little. Any opinions?