[BR3W CITY]

The modern pumps on LS motors should be over-driving the old gear systems. Most common result is one-finger cadillac steering.

If your feeling is heavy, then you could;
Have a physical obstruction/drag on the sytem.
Be foaming your PS fluid and not building hydraulic pressure (note this if your running a cooler or anything)
Have a pressure leak in the system
Bad or dying pump (there are a couple of styles of pump fwiw)