That really really blows!
Damnit, id be so pissed as well.

we'll see what happens tomorrow.

My plan of attack: go to sears service center to see if they can test the wrench for clicking or not, and if it actually failed. get it written. Go back to the store with the wrench and pictures of my cracked manifold. And see what I can do.

You can't f'up a clicky torque wrench...I mean even my sister could figure that out.
( I do blame myself for not going, hey this seems like too much... )