What are you pulling 4Gs in?
172SP...A student of mine asked about high G turns, we were calculated utility category and 75 degree bank is approximately 4 gs. She, a 60 year old women that looked 40, absolutely loved it and screamed like we were on a roller coaster the entire time. I did two 360s banked between 70-75 degrees and half way around the second lap the gyros started their circus act. Only time I have done it in a 172 though, during aerobatic training in a cap 10 I performed multiple high g sustained turns from 3.5-5.5, which is the only reason I felt confident I could perform this.