Torque for most A.C. clutch bolts is 50-55 ft. lbs. I first torque it to 50 ft. lbs then run the sled up and down the road a few miles then re-torque to 55 ft. lbs.
If you have tightened the bolt as tight as you can I would buy a new bolt and try it again. Chances are you have stretched the threads on the bolt.
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