GM Racing LS1 ENGINE KIT INSTALLATION GUIDE
Use old bolt and torque to 110 ft lbs, remove old bolt and tighten to 35 ft lbs and then turn the bolt 140 degrees further.

ASE STG GEN III V8 Specialized Engine Repair Manual 16013.00-2
Same as above

HPBooks CHEVY LS1/LS6 PERFORMANCE by Christopher P. Endres
With old bolt, tighten pulley onto crank to 240 ft lbs, replace with new bolt and torque to 37 ft lbs and then 140 degrees further.