Perhaps. The stock setup lets those blow-by gases vent to the snorkel air cleaner, when there is no vacuum to the PCV valve. Which I guess keeps it contained as opposed to just the valve cover filter vent which lets it out into the engine bay.
When I got my Camaro, it smelled up the garage of gasoline. I eventually noticed that the hose, going from the EVAP canister to the metal vent tube to the fuel tank, was disconnected and venting the tank openly. Plugged it in and it cured the smell. Did you leave the EVAP canister connected too?
