My iPhone has an app that measures G forces. I haven't measured everything, but I measured the Tower of Terror and California Screaming. The Tower of Terror wasn't a lot, I think it maxed out at about 2 Gs. California Screaming was more, maxing out at about 3 Gs.
I'm not sure if G Force ratings are included in the report, but theme parks (at least in California) are required to keep detailed safety information, including accident reports, of all attractions that are available to guests upon request. I think that would be the best place to get accurate info.
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