I'm afraid you guys are a bit confused about the way G-forces interact with your body..
Pitching or rolling in an average commercial sim (like the Steward platform based ones) won't give you no appreciable simulation of G-forces (only a mere peak at 1.5 G at all), it will just simulate the bank or pitch angle at which you're flying.
The most advanced simulator is the DESDEMONA one, which is a combination of Steward platform plus a centrifugal one, and even if capable of sustained G-forces up to 3G, it's still nothing close to the average G forces you can achieve in an aerobatic plane or high performance aircraft.

info about DESDEMONA http://www.amst-germany.de/publics/desdemona_pub.htm

G-manouvers are because of centrifugal force, so the only effective way to reproduce those is to be in a centrifugal machine (which also doesn't give a full simulation because it doesn't take into account lateral loads, but only "head-to-toe" ones).