340 Static Compression Numbers and Test Procedure

Is that HB (damper) center bolt unmarked? If so, that is an ungraded bolt... weak/soft. IIRC, that is a grade 8 bolt. It needs 135 ft-lbs of torque.... An ungraded bolt may strip the threads at that torque.... but I did not check the charts to verify that. And the washer under that bolt is very thick.