Grinding, " diesel " noise under valve covers

Ironracer said

No, I haven't heard one of those bad boy Fords! That's a rare thing here! I think my Bro Doug would about sell the farm for one. But I'll ask him if he's ever heard one tomorrow. I have heard of swapping the pistons ( factory) bank to bank, gives noise, but wraps up quicker. Big Daddy Don's is next weekend....

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Yeah well, they proved that a myth not long ago.

Anyway, I think you've run yourself crazy enough for a little while. I would move on to something else. Get the rest of the car ready and get it aligned and then drive it and see what it sounds like. And sure, you can get it up to temp without driving it, but it's not the same. I don't care how many forum gurus sign off sayin it is. It's not. Good luck!