Grinding, " diesel " noise under valve covers

Nowhere near warmed up. If it's what I'm thinkin, it's gonna quiet down significantly when it's up to temp.
Much Appreciated Rob! Im not sure what you are thinking, but remember you mentioned Piston slap... not sure if that's the current theme. I'm hoping it's piston slap or something else, besides a tore up.wrist pin, bad bearing, scuffed pistons,.ect...in otherwords, something that ain't damaged that i caint, under current situations, ever get fixed. Thank You Brother!