LT1s have a PCV that runs from the front of the intake to the side of the manifold which vents the lifter valley ie the crankcase. Why is there a vent hose from the throttle body to the valvecover? i don't understand the need for it?

Id like to eliminate it if possible....

 

not sure, I thought it was like my 67 Galaxie and that was the PCV. I'd like to know as well.

 

The hose from the throttle body to the valve cover is an intregal part of the PCV/CCV system. That's where the air being drawn into the system comes from. Injuneer has posted many detailed explanations of the system that should be able to be found with a search.