[Unreal]

Chuck, You may be right, but my BB with A/C smog is also over the valve cover. I have hydraulic valves, so I seldom need to get into my valve covers. But when I do, I have to remove the smog hose and check valve.
You would need to do that every time you adjust the solid lifter valves. I wonder why GM would switch to the over cover one, when the front one would eliminate the need to disassemble the smog hose.