Hello to All,
After reading some posts, I thought it best to add info from my groove of my 2003 Chevy 2500 HD.
The PCV valve is located on the driver side valve cover, at firewall. The valve is actually only a restricted orifice - not the traditional shaker style. GM did away with the old style in an attempt to reduce oil consuption. The Vacuum hose attaches to the top of the intake plenum, about 1/2 way forward. Mine came off hard and be carefull not to hit the vacuum line to the fuel pressure regulator - the hard plastice line will break. Pull off the PCV vac line and plug off. As far as I can see, this is the only vac line to plug off on the 6.0 liters. If I'm wrong, let me know.
Scott
