Well you are talking about 8 6mm screws, or bolts combined holding the plate against the engine. I don't know what the shear factor is for a 6mm screw or bolt, but I would bet money on 8 of them being strong enough to lift and engine out of the frame. If one were really concerned you could strip off all extemporaneous engine pieces to lighten the load as much as possible. One could also pre-load the plate on the engine to avoid any sudden movement of the plate on the screws. Anyway that is my plan if I ever need to pull the motor. And the person that made the plate for me still frequents the forum under "Hardgun". Great guy to deal with as I recall.