[scottj]

With regard to engine torque; the loads on the bolts and frame mounts are in the direction compression and tension, so no problem there. There is a bending moment on the engine mounts, but not of sufficient force to cause a problem.

The real loads, I suspect, come from chassis twist on the track. I've experienced enough chassis flex to pinch a door in the opening and crack the door. I've never had a problem with motor mounts though.