Harmonic balancer install?

[snarl95]

How do you keep the motor or crank from turning when torquing down the bolt?

 

[3500GMC]

One of these will usually do the trick.
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[Big T]

I used a demo pry bar bolted to the HB and jammed to the frame cross bar. I used a floor jack bar (pipe) over a big torque wrench to develop the torque.

 

[tanman_2006]

Sledge Hammer and impact wrench.... oh wait that's not right haha

 

[Jaryd]

I used a long 1" open end wrench. I put the open end in the one of the big holes on the HB and wedged the other end on the frame. Worked like a champ for me. The wrench has to be long though.

 

[GM Guy]

I take a pair of allready-bent-numerous-times pulley damper bolts and tighten them down on some pipe spacers and washers, and put a prybar in there.

It is also quite handy to grab ahold of when you are going for the 200 lb/ft with the torque wrench.