The 5.7 I had bought awhile back had all these issues; 1 completely worn down (rear) rod-journal with others starting to go aswell and a number of valveseats had fallen out of the heads.

They may be issues to be concerned about but I still think this are owner-caused problems by running low on oil or using the wrong weight, and letting the engine get too hot maybe because of lack of coolant or too much load.

Oh, one of the camshaft-bearings (no. 4) was semi-welded to the camshaft aswell and had sheared the splines on the camshaft-tube, causing the bearing-'disc' on the camshaft to break loose;

http://www.youtube.com/watch?v=Co_SJjfyBI8&list=UUtrx_z3PXNJYuLEui9O-hkg&index=1


Joy-oh-joy...