Poly-Ball Bushings:
5 degrees of total rotation = 26.1 foot/pounds of torque
7.5 degrees of total rotation = 35.8 foot/pounds of torque
10 degrees of total rotation = 41.7 foot/pounds of torque   

Standard 2 piece setup using only 85 durometer bushings:   
5 degrees of total rotation = 124.7 foot/pounds of torque 
7.5 degrees of total rotation = 156.4 foot/pounds of torque 
10 degrees of total rotation = not measurable with fixture. 
The 1/2" grade 8 bolt twisted in half at 9.2 degrees which was 210 foot/pounds of torque.