Grinding, " diesel " noise under valve covers

That's a sound you would have heard from day 1, it wouldn't just onset one day.

So pages later, if this it really all it is...
Remember...
Details details details!
My sat had 2.5 " pipes, into thrush welded muffs, dumping before the axle... may have never heard it. But I have had this car for a year. Got it running last summer... my Bro says it wasn't there. I'm not sure anymore.. rained out today. Gonna pull fuel pump in a few